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Characterization of particle size and settling velocity of cohesive sediments affected by a neutral exopolymer

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International Journal of Sediment Research 2012年第4期27卷 473-485页

作者： Xiao-ling TAN Guo-ping ZHANG Hang YIN Allen H.REED Yoko furukawa Graduate Research Assistant Department of Civil ＆ Environmental EngineeringLouisiana State University Department of Civil & Environmental Engineering Louisiana State University Graduate Research Assistant Department of Civil & Environmental EngineeringLouisiana State University Research Scientist Seafloor Sciences BranchNaval Research LaboratoryStennis Space Center

In natural waters,exopolymers or extracellular polymeric substances(EPS) exuded by microorganisms interact with clay particles,resulting in the flocculation of clays and hence alteration to the properties of suspended cohesive *** investigate and further understand how neutral EPS affect cohesive sediment transport and the final sediment yield,an experimental study was conducted on laboratory-prepared clay and guar gum(used as an analog for neutral EPS) suspensions to characterize EPS-induced flocculation and the settling velocity of resultant *** different clays consisting of kaolinite,illite,Ca-montmorillonite,and Na-montmorillonite were studied to examine the influence of different layer charges on clay flocculation induced by neutral *** size was determined by a laser particle size analyzer,and settling velocity estimated by analyzing the time-series floc settling images captured by an optical *** indicate that neutral EPS promote clay-EPS flocculation for all four clays with the particle/floc size significantly increased from～0.1-60μm to as large as～600μ***' layer charge has a profound influence on the clay-EPS *** the same floc size,the settling velocity of clay-EPS flocs is typically smaller than that of pure clay flocs,which is attributed to the reduced density of flocs caused by the EPS. However,for flocs of the same composition(*** clay or hybrid clay-EPS mixture),the settling velocity increases with *** fractal dimension of these clay-EPS flocs estimated from settling velocity ranges from 1.39 to 1.47,which are smaller than that of pure clay flocs,indicating that these flocs are less compacted than the pure clay flocs.

关键词： Clay Exopolymer Flocculation Fractal dimension Particle size Settling velocity

Crosstalk Suppression in Header Recognition Unit Using Time-Space Conversion

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光学学报 2003年第S1期23卷 633-634页

作者： Hideaki furukawa Tsuyoshi Konishi Yoshinori Oshita Kazuyoshi Itoh Yoshiki Ichioka Department of Material and Life Science Osaka University Japan.Department of Material and Life Science Osaka University Japan.Department of Material and Life Science Osaka University Japan.Department of Material and Life Science Osaka University Japan.Department of Material and Life Science Osaka University Japan.

We demonstrate a suppression effect of a crosstalk among a target and similar header signals using the header recognition filter designed by a design technique of the multiple-object discriminant filter.

关键词： in it et of that with As be

Interactive Visualization System of Taylor Vortex Flow Using Stokes' Stream Function

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World Journal of Mechanics 2012年第4期2卷 188-196页

作者： Hiroyuki furukawa Department of Mechanical Engineering Meijo University Nagoya Japan

Taylor vortex flow between two concentric rotating cylinders with finite axial length includes various patterns of laminar and turbulent flows, and its behavior has attracted great interests. When mode bifurcation occurs, quantitative parameters such as the volume-averaged energy change rapidly. It is important to visualize the behaviors of vortices. In this study, a three-dimensional visualization system with respect to time is devised. This system can change the viewpoint of flow visualization, and we can observe the track of a vortex from any point. The volume-averaged energy is projected to the track of the center of a vortex. The proposed system can help to investigate the relationship between the mode bifurcation process and the volume-averaged energy.

关键词： Taylor Vortex Flow Axisymmetric Flow Interactive Visualization System Computational Fluid Dynamics Fluid Informatics

海绵作填料在上流式厌氧固定床反应器中厌氧氨氧化

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北京工业大学学报 2009年第12期35卷 1670-1674页

作者：吕鑑张莉 Kenji furukawa 梁小田北京工业大学建筑工程学院北京100124 Graduate School of Science and Technology Kumamoto University 北京市市政工程设计研究总院北京100082

为了研究以海绵作填料进行厌氧氨氧化反应的可行性,在某上流式厌氧固定床反应器中利用人工配制高NH4-N水进行了实验研究.结果表明,利用人工配制废水作为实验用水,在水力停留时间为3.1 h,容积负荷为3.5 kg/(m3.d)时,总氮的去除率可达到7... 详细信息

为了研究以海绵作填料进行厌氧氨氧化反应的可行性,在某上流式厌氧固定床反应器中利用人工配制高NH4-N水进行了实验研究.结果表明,利用人工配制废水作为实验用水,在水力停留时间为3.1 h,容积负荷为3.5 kg/(m3.d)时,总氮的去除率可达到75%.稳态运行时,反应器内部呈碱性,NH4-N去除量、NO2-N去除量与NO3-N的生成量之间的比值为1∶1.21∶0.19.以海绵作填料,与其他填料(新型丙烯酸纤维、聚乙烯醇凝胶)相比,所需启动时间短,操作简便,并能在较短的水力停留时间内高效地处理高浓度的NH4-N废水.

关键词：厌氧氨氧化脱氮亚硝氮硝氮总氮

照顾者积极感受量表在日本痴呆患者照顾者中应用的信效度检验

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International Journal of Nursing Sciences 2021年第2期8卷 210-214,I0006页

作者： Hidetoshi furukawa Chieko Greiner Kansai University of Nursing and Health Sciences AwajiJapan Graduate School of Health Sciences Kobe UniversityHyogoJapan

目的验证照顾者积极感受(Positive Aspects of Caregiving,PAC)量表在日本痴呆患者照顾者中应用的信效度。方法应用翻译及回译方式确定PAC量表的最终译文。2019年1月至7月共调查194名来自日本近畿地区的照顾者,问卷包括日语版PAC量表及... 详细信息

目的验证照顾者积极感受(Positive Aspects of Caregiving,PAC)量表在日本痴呆患者照顾者中应用的信效度。方法应用翻译及回译方式确定PAC量表的最终译文。2019年1月至7月共调查194名来自日本近畿地区的照顾者,问卷包括日语版PAC量表及老年抑郁量表(the Geriatric Depression Scale,GDS)。采用内部一致性信度、重测信度验证量表的信度;采用Pearson相关系数确定校标关联效度。通过最大似然估计和斜交旋转进行探索性因子分析,评价PAC量表的结构。结果日语版PAC量表包含9个条目。探索性因子分析揭示了构成量表的2个因子,分別为生活很充实和自我价值感。问卷的Cmnbach’s α系数为0.895,各个维度Cronbach’s α系数分别为0.896和0.823。重测信度系数为0.721,信度可接受。PAC量表与GDS得分呈负相关(r=-0.548,P<0.01)。结论研究显示,日语版的PAC量表适用于测量日本痴呆照顾者积极感受,尽管其因子结构与原始模型不同。该量表可以帮助医护人员了解照顾者对痴呆症照护的认知程度,并为照护积极程度较低的照顾者提供支持。

关键词：照顾者痴呆日本心理测量学评价

Anatomical variations in wood among four native species of Leguminosae grown in arid areas of China

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Forestry Studies in China 2007年第1期9卷 39-44页

作者： Yang Shu-min Jiang Ze-hui Ren Hai-qing Ikuo furukawa Research Institute of Wood Industry Chinese Academy of Forestry Beijing 100091 E R. China Faculty of Agriculture Tottori University Koyama Tottori 680-8553 Japan

Morphological features and anatomical variations are described and illustrated in detail for four native species of Legnminosae grown in arid sandy regions in China, which are Hedysarum scoparium *** Mey., Caragana korshiskii Kom., Lespedeza bicolor Turcz. and Ammopiptanthus mongolicus （Maxim. ex Kom.） Cheng f. All species showed similar morphological features： distinct growth ring boundaries, ring to semi-ring-porosity, simple perforation plates, alternate intervessel pitting, nonseptate fibers, paratracheal confluent axial parenchyma, helical thickenings and heterocellular rays. However, the vessel arrangement and their quantitative features were different. A. mongolicus had smaller vessel diameters and larger vessel fi＇equency, while the values in the other three species were similar, but bigger than those in A. mongolicus. The variation of vessel lengths and fiber lengths along a horizontal direction showed an irregular tendency. There were significant differences in both fiber lengths and vessel element lengths among trees and within trees, except for A. mongolicus. The relationships between anatomical features of secondary xylem and the adaptability of these species to desert environments are also discussed.

关键词： Leguminosae Papilionoideae variations wood anatomy

Esophageal diverticulum: New perspectives in the era of minimally invasive endoscopic treatment

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World Journal of Gastroenterology 2019年第12期25卷 1457-1464页

作者： Hiroki Sato Manabu Takeuchi Satoru Hashimoto Ken-ichi Mizuno Koichi furukawa Akito Sato Junji Yokoyama Shuji Terai Division of Gastroenterology Niigata University Medical and Dental Hospital Division of Gastroenterology Nagaoka Red Cross Hospital Division of Gastroenterology Niigata City General Hospital Division of Gastroenterology Nagaoka Chuo General Hospital

Esophageal diverticula are rare conditions that cause esophageal symptoms, such as dysphagia, regurgitation, and chest pain. They are classified according to their location and characteristic pathophysiology into three types: epiphrenic diverticulum, Zenker's diverticulum, and Rokitansky diverticulum. The former two disorders take the form of protrusions, and symptomatic cases require interventional treatment. However, the esophageal anatomy presents distinct challenges to surgical resection of the diverticulum, particularly when it is located closer to the oral orifice. Since the condition itself is not malignant,minimally invasive endoscopic approaches have been developed with a focus on alleviation of symptoms. Several types of endoscopic devices and techniques are currently employed, including peroral endoscopic myotomy(POEM). However,the use of minimally invasive endoscopic approaches, like POEM, has allowed the development of new disorder called iatrogenic esophageal diverticula. In this paper, we review the pathophysiology of each type of diverticulum and the current state-of-the-art treatment based on our experience.

关键词： Diverticulum Esophagus Epiphrenic diverticulum Zenker's diverticulum Rokitansky diverticulum Iatrogenic disease Esophageal achalasia Peroral endoscopic myotomy Diverticulectomy

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高温好氧金属膜生物反应器处理合成生活污水

大连理工大学学报 2007年第6期47卷 798-802页

作者：张寿通杨凤林 YAMADA Yuji furukawa Kenji 大连理工大学环境与生命学院辽宁大连116024 日立金属有限公司日本熊本大学工程系熊本日本

将0.5μm孔径的平板式不锈钢膜组件应用于高温好氧膜生物反应器中处理合成生活废水.在35～55℃温度范围,反应器具有较高的污染物去除效率,出水水质稳定.平均进水COD为853.3mg/L,出水为19.2mg/L,去除率为97.7%.膜渗透液中无悬浮物.与常... 详细信息

将0.5μm孔径的平板式不锈钢膜组件应用于高温好氧膜生物反应器中处理合成生活废水.在35～55℃温度范围,反应器具有较高的污染物去除效率,出水水质稳定.平均进水COD为853.3mg/L,出水为19.2mg/L,去除率为97.7%.膜渗透液中无悬浮物.与常温生物处理工艺相比,高温好氧处理污泥沉降性较差,污泥净增长量较低,发现的嗜热菌主要为嗜热杆菌.生物污染是膜的主要污染类型,EPS是导致膜污染的主要因素.用次氯酸钠溶液清洗可以有效恢复膜通量.实验表明,不锈钢膜在高温膜生物反应器污水处理工艺中有很大的应用潜力.

关键词：膜生物反应器金属膜高温好氧处理嗜热杆菌污泥沉降性膜污染

Study on Non-Uniqueness of Taylor Vortex Flow Changing Inner Cylinder Acceleration Time

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World Journal of Mechanics 2018年第8期8卷 301-310页

作者： Hiroyuki furukawa Tomohito Suzuki Department of Mechanical Engineering Meijo University Nagoya Japan

In concentrically rotating double cylinders consisting of a stationary outer cylinder a rotating inner cylinder, Taylor vortex flow appears. Taylor vortex flow occurs in journal bearings, various fluid machineries, containers for chemical reaction, and other rotating components. Therefore, the analysis of the flow structure of Taylor vortex flow is highly effective for its control. The main parameters that determine the modes of Taylor vortex flow of a finite length are the aspect ratio, Reynolds number Re. Aspect ratio is defined as the ratio of the cylinder length to the gap length between cylinders, and Re is determined on the basis of the angular speed of the inner cylinder. Aspect ratio was set to be 4.0, and Re to be values in the range from 100 to 1000 at intervals of 100. Thus far, a large number of studies on Taylor vortex flow have been carried out;however, the effects of the differences in initial conditions have not yet been sufficiently clarified. In this study, we changed the acceleration time of the inner cylinder in a numerical analysis, and examined the resulting changes in the mode formation and bifurcation processes. The acceleration time was changed from 1.0 s to 10.0 s. As a result, a difference was observed in the final mode depending on the difference in the acceleration time. From this finding, non-uniqueness, which is a major characteristic of Taylor vortex flow, was confirmed. However, no regularities regarding the difference in mode formation were found and the tendency of the mode formation process was not specified. Moreover, the processes of developing the vortex resulting in different final modes were monitored over time by visual observation. Similar flow behaviors were initially observed after the start of the calculation. Then, a bifurcation point, at which the flow changed to a mode depending on the acceleration time observed, and finally the flow became steady. In addition, there was also a difference in the time taken for the wel

关键词： Rotating Cylinders Flow Instability Bifurcation EFD and CFD Non-Uniqueness