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Effects of Clearance between Rotor and Ground on the Performance of an Open Cross-Flow-Type Nano-Hydraulic Turbine

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Journal of Energy and Power Engineering 2016年第8期10卷 465-473页

作者： Tomomi Uchiyama Shouhei Mizoguchi Shouichiro Iio yusuke katayama Toshihiko Ikeda Institute for Materials and Systems for Sustainability Nagoya University Nagoya 464-8603 Japan Toyota Motor Corporation Toyota 471-8571 Japan Faculty of Engineering Shinshu University Nagano 380-8553 Japan

Flows through an open cross-flow-type nano-hydraulic turbine are numerically simulated to investigate the effects of the clearance Hc between the rotor and the ground on the turbine performance. A two-dimensional particle method is employed, which was successfully used for flow simulations of impulse-type and open cross-flow-type nano-hydraulic turbines in the authors＇ previous works. When the clearance Hc is smaller than a critical value, the simulated turbine performance decreases with decreasing Hc, in good agreement with the experiment. The simulations make it clear that such a reduction of turbine performance is attributable to an increase in the circumferential component of the water velocity at the rotor outlet. The simulations also demonstrate that the effect of the tip speed ratio of the rotor on the relation between Hc and turbine performance can be analyzed.

关键词： Nano-hydraulic turbine computer simulation waterfall particle method.

Suppression of Vortex Precession in a Non-Contact Handling Device by a Circular Column

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Journal of Flow Control, Measurement & Visualization 2016年第2期4卷 70-78页

作者： Shouichiro Iio Katsuya Hayashi Eri Akahane yusuke katayama Xin Li Toshiharu Kagawa Department of Environmental Science and Technology Shinshu University Nagano Japan

Vortex levitation attains non-contact handling by injecting air through a tangential nozzle into a cylindrical cup generating the swirling flow. The precessing of the swirling flow causes pressure fluctuation. This phenomenon becomes apparent as the gap between the cup and workpiece increases, which significantly disturbs the stability of conveyance. In this paper, suppression of pressure fluctuation by a cylindrical column that stabilizes the vortex levitation is described and its mechanism is mentioned. According to the experimental set up, the pressure was measured at the center of the workpiece and the wall of the cup;velocity field under the work piece was visualized by PIV. The result suggested that the larger diameter column denoted the effect on suppression of the fluctuation because the precessing of the swirling flow became stable. On the other hand, variation of the column thickness had insignificant effect on suppressing the fluctuation, but sucking force became weakened since the swirling velocity decreased.

关键词： Non-Contact Handling Swirling Flow Pressure Fluctuation Visualization

Jet Flapping Control with Acoustic Excitation

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Journal of Flow Control, Measurement & Visualization 2013年第2期1卷 49-56页

作者： Shouichiro Iio Ken Hirashita yusuke katayama Yoshiaki Haneda Toshihiko Ikeda Tomomi Uchiyama Department of Environmental Science and Technology Shinshu University Nagano Japan Department of Mechanical Engineering Nagano National College of Technology Nagano Japan EcoTopia Science Institute Nagoya University Nagoya Japan

The dynamics of flapping motion of a rectangular jet under acoustic excitation is studied experimentally by means of hot-wire measurement and flow visualization with smoke method. The excitation sufficiently enables“phase-lock”, which permitted us to extract the organized wave motion from a background field of finite turbulent fluctuations. The mean and fluctuation velocity are investigated and focused on the excitation frequency and the Reynolds number. As the excitation frequency decreases, it was found that the jet flapping and the jet spread were enhanced. The excitation with sub-harmonic frequency has significant effects on the rectangular jet behavior. The maximum value of the periodic velocity fluctuation strongly depends on the excitation frequency.

关键词： Jet Control Rectangular Jet Vortex Hot Wire Visualization

Joint input–output identiﬁcation of unstable systems with kernel regularization

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Control Theory and Technology 2024年第2期22卷 195-202页

作者： yusuke Fujimoto Toshiharu Sugie Department of Environmental Engineering the University of Kitakyushu1-1HibikinoWakamatsu-kuKitakyushu 8080135FukuokaJapan Professor Emeritus Kyoto UniversityYoshida-HonmachiSakyo-kuKyoto 6068501KyotoJapan

This paper discusses closed-loop identiﬁcation of unstable *** particular,weﬁrst apply the joint input–output identiﬁcation method and then convert the identiﬁcation problem of unstable systems into that of stable systems,which can be tackled by using kernel-based regularization *** propose to identify two transfer functions by kernel regularization,the one from the reference signal to the input,and the one from the reference signal to the *** these transfer functions are stable,kernel regularization methods can construct their accurate *** the model of unstable system is constructed by ratio of these *** effectiveness of the proposed method is demonstrated by a numerical example and a practical experiment with a DC motor.

关键词： Closed-loop identification Kernel regularization Joint input-output identification

Experimental aspects of ^(14)N overtone RESPDOR solid-state NMR spectroscopy under MAS beyond 60 kHz

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Magnetic Resonance Letters 2024年第1期4卷 40-49页

作者： Yutaro Ogaeri yusuke Nishiyama JEOL Ltd. AkishimaTokyo196-8558Japan

Nitrogen-14(^(14)N)overtone(OT)spectroscopy under fast magic angle spinning(MAS)conditions(>60 kHz)has emerged as a powerful technique for observing correlations and distances between ^(14)N and ^(1)H,owing to the absence of the first-order quadrupolar broad*** addition,^(14)N^(OT) allows selective manipulation of ^(14)N nuclei for each *** extensive theoretical and experimental studies,the spin dynamics of ^(14)N^(OT) remains under *** this study,we conducted experimental investigations to assess the spin dynamics of ^(14)N^(OT) using the rotational-echo saturation-pulse double-resonance(RESPDOR)sequence,which monitors population transfer induced by a^(14)N^(OT) *** ^(14)N^(OT) spin dynamics is well represented by a model of a two-energy-level *** spin-1/2,the maximum excitation efficiency of ^(14)N^(OT) coherences of powdered solids,denoted by p,depends on the radiofrequency field(rf-field)strength due to orientation dependence of effective nutation fields even when pulse lengths are *** is also found that the p factor,contributing to the ^(14)N^(OT) spin dynamics,is nearly independent of the B0 ***,the filtering efficiency of RESPDOR experiments exhibits negligible dependence on B0 when the ^(14)N^(OT) pulse length is *** study also identifies the optimal experimental conditions for ^(14)N^(OT)/^(1)H RESPDOR correlation experiments.

关键词： ^(14)N Overtone RESPDOR ^(14)N/^(1)H correlation Solid-state NMR Fast MAS

Extramedullary Implantation of Neural Stem/Progenitor Cells in Chitosan Channels,Local Delivery of Soluble Nogo66 Receptor and bFGF/EGF/PDGF Promote Long-term Transplant Survival and Axonal Regeneration after Complete Transection of the Rat Spinal Cord

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Extramedullary Implantation of Neural Stem/Progenitor Cells ...

Extramedullary Implantation of Neural Stem/Progenitor Cells in Chitosan Channels,Local Delivery of Soluble Nogo66 Receptor and bFGF/EGFIPDGF Promote Long-term Transplant Survival and Axonal Regeneration after Complete Transection of the Rat Spinal Cord

泛长江流域骨科新进展暨第九届全国骨科护理研讨会

作者： Tasneem Zahir Molly S.Shoichet Cindi Morshead yusuke katayama Charles H.Tator 华中科技大学同济医学院协和医院骨科 Toronto Western Research Institute Division of NeurosurgeryToronto Western HospitalUniversity of Toronto

Adult central mammalian axons show minimal regeneration after spinal cord transaction(SCT)injury due to extensive cell death, absence of growth-promoting molecules in the CNS, and inhibitors of axonal out- *** study attempted to address the multiple impediments to regeneration by using a combinatory strategy to enhance cell survival and remyelination after complete spinal cord transection in adult rats comprising:(1)implan- tation of adult rat brain-derived neural stern/progenitor cells(NSPCs);(2)extramedullary chitosan channel to promote axonal regrowth and reduce the barrier caused by scar tissue;(3)local delivery of a novel rat soluble Nogo -66 receptor protein(NgR(310)ecto-Fc)to block the inhibitory effect of myelin-derived inhibitors including Nogo,myelin-associated glyeoprotein(MAG),and oligodendrocyte-myelin glycoprotein(OMgp);and(4)local delivery of basic fibroblast growth factor,epidermal growth factor and platelet-derived growth *** results showed that extramedullary chitosan channel implantation in combination with growth factors produced excellent long -term survival of the NSPCs after *** factors significantly induced NSPC differentiation into oligodendro- cytes,especially,and ***(310)ecto-Fc significantly decreased astrocytic differentiation of *** (310)ecto-Fc alone or in combination of NgR(310)ecto-Fc with NSPCs significantly enhanced axonal regenera- tion and increased the area of the bridge between the cord *** the combination of NgR(310)ecto-Fc, growth factors and NSPCs had no synergetic effect on axonal regeneration, the combination increased the area of the tissue in the bridge.A very small number of descending corticospinal tract axons grew into the central portions of the bridges as shown by anterograde tracing of the corticospinal tract with *** findings suggest that although the majority of the regenerated axons in the channels originated from host neurons likely situated predominantly i

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Extramedullary Implantation of Neural Stem/Progenitor Cells ...

Assessing efficacy of standard impregnation techniques on die-cast aluminum alloys using X-ray micro-CT

第八届全国脊柱脊髓损伤学术会议

作者：郭晓东 Tasneem Zahir Molly S.Shoichet Cindi Morshead yusuke katayama Charles H.Tator 华中科技大学同济医学院协和医院骨科华中科技大学同济医学院协和医院骨科

＜正＞Adult central mammalian axons show minimal regeneration after spinal cord transaction（SCT）injury due to extensive cell death,absence of growth-promoting molecules in the CNS, and inhibitors of axonal *** study attempted to address the multiple impediments to regeneration by using a combinatory strategy to enhance cell survival and remyelination after complete spinal cord transection in adult rats comprising:（1）implantation of adult rat brain-derived neural stem/progenitor cells（NSPCs）;（2）extramedullary chitosan channel to promote axonal regrowth and reduce the barrier caused by scar tissue;（3）local delivery of a novel rat soluble Nogo-66 receptor protein（NgR（310）ecto-Fc）to block the inhibitory effect of myelin-derived inhibitors including Nogo, myelin-associated glycoprotein（MAG）, and oligodendrocyte-myelin glycoprotein（OMgp）;and（4）local delivery of basic fibroblast growth factor, epidermal growth factor and platelet-derived growth *** results showed that extramedullary chitosan channel implantation in combination with growth factors produced excellent long-term survival of the NSPCs after *** factors significantly induced NSPC differentiation into oligodendrocytes, especially,and astrocytes. NgR（310）ecto-Fc significantly decreased astrocytic differentiation of ***（310）ecto-Fc alone or in combination of NgR（310）ecto-Fc with NSPCs significantly enhanced axonal regeneration and increased the area of the bridge between the cord stumps. Although the combination of NgR（310）ecto-Fc,growth factors and NSPCs had no synergetic effect on axonal regeneration,the combination increased the area of the tissue in the bridge.A very small number of descending corticospinal tract axons grew into the central portions of the bridges as shown by anterograde tracing of the corticospinal tract with *** findings suggest that although the majority of the regenerated axons in the channels originated from host neurons likely situated predominantly in the

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China Foundry 2024年第3期21卷 276-286页

作者： Ajith Bandara Koichi Kan Katanaga yusuke Natsuto Soga Akifumi Koike Toru Aoki Hamamatsu TSC Chuo Hatsumei Institute322 lida-choMinami-kuHamamatsu435-0028Japan Graduate School of Medical Photonics ShizuokaUniversityJohoku 3-5-1HamamatsuShizuoka432-8561Japan ANSeeN Inc Johoku 3-5-1HamamatsuShizuoka432-8561Japan Research Institute of Electronics ShizuokaUniversityJohoku 3-5-1HamamatsuShizuoka432-8561Japan

Utilizing lightweight Al alloys in various industrial applications requires achieving precise pressure tightness and leak *** pressure impregnation(VPI)with thermosetting polymers is commonly used to address leakage defects in die-cast Al *** this study,the efficacy of the VPI technique in sealing alloy parts was investigated using a combination of nondestructive micro X-ray computed tomography(micro XCT)and a standard leak *** results demonstrate that the commonly used water leak test is insufficient for determining the sealing ***,micro XCT shows distinct advantages by enabling more comprehensive *** reveals the presence of a low atomic number impregnates sealant within casting defects,which has low grey contrast and allows for visualizing primary leakage paths in *** effective atomic number of impregnated resin is 6.75 and that of Al alloy is 13.69 by dual-energy X-ray *** research findings will contribute to enhancing the standard VPI process parameters and the properties of impregnating sealants to improve quality assurance for impregnation in industrial metals.

关键词： nondestructive testing Al alloy die-casting vacuum pressure impregnation micro X-ray computed tomography duel-energy X-ray CT

Comment on:Recurrence after spontaneous separation of epiretinal membrane in a young woman:a case report

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International Journal of Ophthalmology(English edition) 2024年第4期17卷 783-784页

作者： yusuke Kameda Yutaka Kaneko Karin Ishinabe Nichika Fukuoka Yotsuya-sanchome Ekimae Eye Clinic Tokyo 160-0004Japan Department of Ophthalmology and Visual Sciences Yamagata University Faculty of MedicineYamagata 990-9585Japan

Dear Editor,Herein,we provide a commentary on the recently published article by Zeng QZ and Yu WZ[1].This case report provides interesting novel insights into the recurrence of epiretinal membrane(ERM)following self-separation in a young *** addition to the study,we have been investigating spontaneous ERM release for many years and have recently published a related paper[2].

关键词： separation young release