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| 1 | Numerical analysis of cavitation cloud shedding in a submerged water jet显示文摘Focused on the unsteady behavior of high-speed water jets with intensive cavitation a numerical analysis is performed by applying a practical compressible mixture flow bubble cavitation model with a simplified estimation of bubble radius. The mean flow of two-phase mixture is calculated by unsteady Reynolds averaged Navier-Stokes(URANS) for compressible flow and the intensity of cavitation in a local field is evaluated by the volume fraction of gas bubbles whose radius is estimated with a simplified RayleighPlesset equation according to pressure variation of the mean flow field. High-speed submerged water jet issuing from a sheathed sharp-edge orifice nozzle is treated. The periodically shedding of cavitation clouds is captured in a certain reliability compared to experiment data of visualization observation and the capability to capture the unsteadily shedding of cavitation clouds is demonstrated. The results demonstrate that cavitation takes place near the entrance of nozzle throat and cavitation cloud expands consequentially while flowing downstream. Developed bubble clouds break up near the nozzle exit and shed downstream periodically along the shear layer. Under the effect of cavitation bubbles the decay of core velocity is delayed compared to the case of no-cavitation jet. | Guoyi PENG 杨从新 Yasuyuki OGUMA Seiji SHIMIZU | 2016 | Journal of Hydrodynamics2016，28，6： | 10 |
| 2 | 环境样品中痕量铅的流动注射在线分离及分光光度检测(英文)显示文摘A flow injection method has been developed for the determination of lead in environmental samples by use of on line preconcentration on a Pb·Spec TM column and spectrophotometric detection. The lead in sample solutions was adsorbed selectively on the column from 1mol·l -1 nitric acid and the retained lead was eluted with 0 1mol·l -1 ammonium oxalate.4 (2 pyridylazo)resorcinol (PAR) was used as a chromogenic reagent at pH 10 and the absorbance of Pb PAR complex was monitored at 530 nm. The pumps, valves and spectrophotometer were controlled by a personal computer. The detection limit (3 σ ) was 3ng of lead. The RSD is 1 7% at a level of 0 4μg lead. The proposed method was successfully applied to the determination of lead in fly ash of an incinerator for industrial waste and in river water certified reference material provided by the Japan Society for Analytical Chemistry. | TOMIOKA Kenichi OGUMA Koichi SEKI Tatsuya | 2003 | 环境化学2003，22，3： | 5 |
| 3 | 应力比对WC-Co硬质合金疲劳寿命及裂纹生长行为的影响(英文)显示文摘通过两种疲劳试验:旋转弯曲疲劳试验和3-或4-点弯曲疲劳试验测试细晶WC-Co硬质合金的裂纹生长行为和疲劳寿命。疲劳试验结果表明:所测试的大部分WC-Co硬质合金的疲劳寿命取决于裂纹生长周期。利用断裂力学基本方程推导出疲劳裂纹生长速率(da/dN)和最大应力强度因子(Kmax)的关系。根据此关系,获得材料的强度因子阈值(Kth)和疲劳断裂韧性值(Kfc)。基于修正的线性弹性断裂力学方程,对WC-Co硬质合金材料的疲劳寿命进行计算,疲劳寿命的计算结果与实验结果吻合较好。 | Hiroko MIKADO Sotomi ISHIHARA Noriyasu OGUMA Kenichi MASUDA Syo KITAGAWA Shingo KAWAMURA | 2014 | Transactions of Nonferrous Metals Society of China2014，24，S1： | 4 |
| 4 | Reinfection rate of Helicobacter pylori after eradication treatment: a long-term prospective study in Japan显示文摘 | Susumu Take Motowo Mizuno Kuniharu Ishiki Takayuki Imada Tetsuji Okuno Tomowo Yoshida Kenji Yokota Keiji Oguma Masahide Kita Hiroyuki Okada Kazuhide Yamamoto | 2012 | Journal of Gastroenterology2012，，6： | 2 |
| 5 | Baseline gastric mucosal atrophy is a risk factor associated with the development of gastric cancer after Helicobacter pylori eradication therapy in patients with peptic ulcer diseases显示文摘 | Susumu Take Motowo Mizuno Kuniharu Ishiki Yasuhiro Nagahara Tomowo Yoshida Kenji Yokota Keiji Oguma | 2007 | Journal of Gastroenterology2007，，17： | 2 |
| 6 | Simultaneous removal of dissolved organic matter and bromide from drinking water source by anion exchange resins for controlling disinfection by-products显示文摘Anion exchange resins(AERs) with different properties were evaluated for their ability to remove dissolved organic matter(DOM) and bromide, and to reduce disinfection by-product(DBP) formation potentials of water collected from a eutrophic surface water source in Japan. DOM and bromide were simultaneously removed by all selected AERs in batch adsorption experiments. A polyacrylic magnetic ion exchange resin(MIEX) showed faster dissolved organic carbon(DOC) removal than other AERs because it had the smallest resin bead size. Aromatic DOM fractions with molecular weight larger than 1600 Da and fluorescent organic fractions of fulvic acid- and humic acid-like compounds were efficiently removed by all AERs. Polystyrene AERs were more effective in bromide removal than polyacrylic AERs. This result implied that the properties of AERs, i.e. material and resin size, influenced not only DOM removal but also bromide removal efficiency. MIEX showed significant chlorinated DBP removal because it had the highest DOC removal within 30 min, whereas polystyrene AERs efficiently removed brominated DBPs, especially brominated trihalomethane species. The results suggested that, depending on source water DOM and bromide concentration,selecting a suitable AER is a key factor in effective control of chlorinated and brominated DBPs in drinking water. | Athit Phetrak Jenyuk Lohwacharin Hiroshi Sakai Michio Murakami Kumiko Oguma Satoshi Takizawa | 2014 | Journal of Environmental Sciences2014，26，6： | 2 |
| 7 | Chronic Infections and Atherosclerosis显示文摘 | Kiyoshi Ayada Kenji Yokota Kazuko Kobayashi Yehuda Shoenfeld Eiji Matsuura Keiji Oguma | 2009 | Clinical Reviews in Allergy & Immunology2009，，1： | 2 |
| 8 | New Fe - based Soft Magnetic Alloys Composed of Ultrafine Grain Structure 显示文摘 | Yoshizawa Y Oguma S Yamauchi Y | 1988 | J Appl Phys1988，64，： | 1 |
| 9 | 显示文摘 | Yoshizawa Y Oguma S and Yamauchi K | 1988 | J Appl Phys1988，64，： | 1 |
| 10 | Treatment of recurrence or residual lesions after EMR for early gastric cancer[in Japanese with English abstract]显示文摘 | Kawaguchi M Oguma K Misaka R | | Stomach and Intestine0，，： | 1 |
| 11 | Flat-passband interieaver filter with 200 GHz channel spacing based on planar lightwave circuit-type lattice structure 显示文摘 | OGUMA M JINGUJI K KITOH T | 2000 | Electron Lett2000，36，15： | 1 |
| 12 | Seasonal changes in the relationship between photochemical reflectance index and photosynthetic light use efficiency of Japanese larch needles 显示文摘 | Nakaji T Oguma H Fujinuma Y | 2006 | lnt J Remote Sens2006，27，3： | 1 |
| 13 | Monoclonal antibody to trivalent chromium chelate complex and its application to measurement of the total chromium concentration显示文摘 | Sasaki K Oguma S Namiki Y | 2009 | Anal Chem2009，81，10： | 1 |
| 14 | Fe-based soft magnetic alloys composed of ultrafine grain structure显示文摘 | YOSHIZAWA Y OGUMA S YAMAUCHI K | 1988 | Journal of Applied Physics1988，64，： | 1 |
| 15 | Inhibition of glucocorticoid-induced apoptosis by the expression of antisense gene of mitochondrial ATPase subunit 6( 1 )显示文摘 | Sato M Matsuki Y Oguma T | 2000 | FEBS Lett2000，478，12： | 1 |
| 16 | 显示文摘 | Yoshizawa Y Oguma S | 1988 | J Appl Phys1988，64，： | 1 |
| 17 | 显示文摘 | Yoshizawa Y Oguma S Yamauchi K | 1988 | J Appl Phys1988，64，： | 1 |
| 18 | Absent or extremely low neutrophil alkaline phosphatase activity levels in patients with myelodysplastic syndromes显示文摘 | Yoshida Y Katsurada T Oguma S | 2012 | Intem Med2012，52，4： | 1 |
| 19 | Detection of bone marrow micrometastasis in gastric cancer patients by immunomagnetic separation 显示文摘 | MATSUNAMI K NAKAMURA T OGUMA H | 2003 | Ann Surg Oncol2003，10，2： | 1 |
| 20 | New Fe-based Soft Magnetic Alloys Composed of Ultrafine Grain Structure 显示文摘 | Yoshizawa Y Oguma S Yamauchi K | 1988 | J Appl Phys1988，64，： | 1 |
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