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Acoustic Noise from Tandem Wind Rotors of Intelligent Wind Power Unit

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Journal of Thermal Science 2010年第2期19卷 120-125页

作者： koichi Kubo Nobuhiko Mihara Akira Enishi Toshiaki Kanemoto Kyushu Institute of Technology:Sensui 1-1

The authors had invented the unique wind power unit composed of the large-sized front wind rotor,the small-sized rear wind rotor and the peculiar generator with the inner and the outer rotational armatures without the conventional *** unit is called "Intelligent Wind Power Unit" by the *** front and the rear wind rotors drive the inner and the outer armatures,respectively,while the rotational torque is counter-balanced between both armatures/wind *** paper discusses experimentally the acoustic noise from the front and the rear wind *** acoustic noise,in the counter-rotating operation,is induced mainly from the flow interaction between both rotors,and has the dominant power spectrum density at the frequency of the blade passing *** noise is caused mainly from the turbulent fluctuation due to the flow separation on the blade,when the rear wind rotor stops or rotates in the same direction as the front wind rotor.

关键词： Acoustic noise Wind turbine Tandem wind rotors Counter-rotation

Magnetic and magnetocaloric properties in GdZn_(2) synthesized by ball milling

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Journal of Rare Earths 2022年第3期40卷 462-466,I0004页

作者： Keisuke T.Matsumoto Akihiro Hosokawa koichi Hiraoka Graduate School of Science and Engineering Ehime University3Bunkyo-choMatsuyamaEhime790-8577Japan

In this study,we prepared GdZn_(2)by mechanical alloying method and measured its magnetization to reveal the magnetic and magnetocaloric *** a milling time(MT)≥10 and 20 h,the GdZn_(2)phase was confirmed by X-ray diffraction *** MT=40 and 60 h,amorphous like patterns are *** MT=10 and 20 h,magnetization(M)as a function of temperature below 80 K shows ferromagnetic-like *** observed values of M are 4.5μ_(B) at 5 K for MT=10 and 20 h,which is smaller than that of the theoretical expected value of 7μ_(B).For MT=40 and 60 h,the long-range ferromagnetic order collapses because there is no spontaneous *** value ofΔT,whereΔT is the full width at half maximum of the magnetic entropy change(ΔS_(m)(T)),increases significantly for MT≤20 h because of the gradual release of magnetic entropy by the milling *** M decreases with increasing MT,the maximum values of|ΔS_(m)|,the relative cooling power,and the refrigerant capacity also decreases.

关键词： Mechanical alloying Magnetocaloric effect GdZn_(2) Rare earths

Deformation Mechanism and Stabilization of Martensite in TiNi Shape Memory Alloy

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Journal of Materials Science & Technology 2010年第10期26卷 936-940页

作者： Shuai Wang koichi Tsuchiya Lei Wang Minoru Umemoto Key Laboratory for Anisotropy and Texture of Materials Northeastern University Shenyang 110819 China Structural Functions Research Group Innovative Materials Engineering Laboratory National Institute for Materials Science Tsukuba 305-0047 Japan Department of Production Systems Engineering Toyohashi University of Technology Toyohashi 441-8580 Japan

The deformed microstructures of a TiNi shape memory alloy were investigated in present study to clarify the deformation *** is found that the stress-strain curve was divided into three stages based on the deformation *** cause of martensitic stabilization effect was also interpreted by paying special attention to the deformed *** electron microscopic examination revealed that at the early stage of deformation martensitic reorientation and compound twinning relieved some of the elastic strain energy stored in martensite,and this contributes to the martensitic stabilization ***,when deformation strain became larger,the density of dislocations increased *** boundaries were also *** degree of ordering was therefore decreased due to dislocations and antiphase *** disordering was another cause of martensitic stabilization *** the middle stage of deformation martensitic stabilization was attributed to the two reasons above.

关键词： TiNi shape memory alloy Transmission electron microscopy Ordering Dislocation Martensitic transformation

Martensitic stabilization and defects induced by deformation in TiNi shape memory alloys

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International Journal of Minerals,Metallurgy and Materials 2011年第1期18卷 66-69页

Martensitic stabilization caused by deformation in a TiNi shape memory alloy was *** attention was paid to the deformed microstructures to identify the cause of martensitic *** stabilization was demonstrated by differential scanning calorimetry for the tensioned TiNi shape memory *** electron microscopy revealed that antiphase boundaries were formed because of the fourfold dissociation of [110]B19＇ super lattice dislocations and were preserved after reverse transformation due to the lattice *** stabilization was attributed to dislocations induced by deformation,which reduced the ordering degree of the microstructure,spoiled the reverse path from martensite to parent phase compared with thermoelastic transformation,and imposed resistance on phase transformation through the stress field.

关键词： shape memory alloys transmission electron microscopy martensitic transformations stabilization defects

Surface manipulation of a triple-conducting cathode for protonic ceramic fuel cells to enhance oxygen reduction activity and CO_(2) tolerance

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Journal of Energy Chemistry 2023年第12期87卷 450-459,I0012页

作者： Wenwen Zhang Hiroki Muroyama Yuichi Mikami Toshiaki Matsui koichi Eguchi Department of Energy and Hydrocarbon Chemistry Graduate School of EngineeringKyoto UniversityNishikyo-kuKyoto 615-8510Japan Technology Division Panasonic Holdings Corporation3-1-1 Yagumo-naka-machiMoriguchi CityOsaka 570-8501Japan

One of the main obstacles limiting the performance of protonic ceramic fuel cells(PCFCs) is the sluggish kinetics of the oxygen reduction reaction(ORR) at reduced ***,the surface manipulation of a triple-conducting cathode BaCe_(0.5)Pr_(0.3)Y_(0.2)O_(3-δ)(BCPY) by an efficient catalyst coating PrNi_(0.5)Co_(0.5)O_(3-δ)(PNC) to enhance the ORR activity and CO_(2) tolerance is *** developed PNC-coated BCPY cathode achieves the polarization resistance of 0.25 and 1.00 Ω cm^(2) at 600 and 500 ℃,respectively,approximately 1/5 of that for the pristine BCPY cathode(0.99 and 4.79 Ω cm^(2)),while maintaining an excellent CO_(2) *** single cell on a BaZr_(0.8)Yb_(0.2)O_(3-δ) electrolyte also exhibits a high peak power density of 0.79 W cm^(-2)at 700 ℃ and a stable operation for 200 h at 600 ℃.Such high ORR activity is mainly attributed to the synergistic effect of BCPY support and PNC ***,BCPY provides a tripleconducting path(mainly protons),and PNC nanoparticles facilitates surface oxygen exchange and steam adsorption/desorption processes due to the enriched surface oxygen *** study will provide a new design strategy for developing high-performance PCFCs cathode.

关键词： Triple-conducting cathode Surface manipulation Oxygen reduction reaction CO_(2)tolerance Protonic ceramicfuel cells

Present status and recent advances in living donor liver transplantation for malignant hepatic tumors

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Hepatobiliary & Pancreatic Diseases International 2008年第2期7卷 126-134页

作者： Yasutsugu Takada Shinji Uemoto koichi Tanaka Department of Hepatobiliary & Pancreatic and Transplantation Faculty of Medicine Kyoto University Japan

BACKGROUND: Living donor liver transplantation (LDLT) has been increasingly used to treat hepatic tumors worldwide in recent years, and is currently the most effective alternative to deceased donor liver transplantation to overcome the problem of organ shortage. LDLT has played an enormous role in treating early malignant hepatic tumors. But the indication of LDLT for malignant hepatic tumors is based on indefinite criteria. This review summarizes the recent studies in LDLT for treating malignant hepatic tumors. DATA SOURCES: A literature research of the PubMed database was conducted and research articles were reviewed. RESULTS: The current data on LDLT for malignant hepatic tumors, combined with our hospital experience, indicated that if a patient with hepatocellular carcinoma (HCC) who meets with the conventional Milan criteria cannot undergo tumor resection because of poorly preserved liver function, and a cadaveric graft is difficult to obtain within six months, LDLT may be selected. In a patient with recurrence of HCC after conventional therapies, feasibility, optimal timing, and efficacy of LDLT as a second-line treatment should be determined. CONCLUSIONS: Tumor recurrence is related to the biological behavior and staging of the tumor. New immunosuppressors which have anti-tumor effects and inhibit the immune system need to be developed. The indications of LDLT for hepatic malignant tumors should be selected meticulously.

关键词： living donor liver transplantation liver neoplasms indication recurrence

Quantitative evaluation of die casting surface defect severity by analyzing surface height

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China Foundry 2017年第5期14卷 339-345页

作者： Yan Xu Naoya Hirata koichi Anzai Department of Metallurgy Graduate School of EngineeringTohoku UniversitySendai 980-85 79Japan

It is necessary in factories to assess the severity of the surface defects of castings, as a slight surface defect will be taken as qualified when it brings no bad effect or it can be removed by the subsequent processing. In practical production, professional technicians visually inspect the surface defect severity according to their individual experience. Therefore, it is difficult for them to maintain the same standard and accuracy in the subjective, tedious and labor-intensive work. Recently, image processing techniques based on optical images have been applied to achieve better accuracy and high efficiency. Unfortunately, optical images cannot directly quantify surface depth, which works as a crucial factor in the practical assessment of surface defect severity. The surface roughness evaluation algorithm, which takes into account of both area and depth information of the assessed surface, was applied to directly characterize surface defect severity based on surface asperity rather than optical image. The results using standard casting pieces show that surface defect severity has no apparent dependence on surface roughness. However, the subsequent results show that the root-mean-squared-deviation(RMSD) of surface gradient of flow line defects positively correlates with the increase of defect severity. The other types of defect do not present such tendency. Thus, practical workpieces with flow line defects on the surface were used to verify the universality of this tendency. The results show that surface roughness of an unqualified workpiece is larger than that of a qualified workpiece after surface slope adjustment, but presents no obvious coincidence before the adjustment. In contrast, the RMSD of an unqualified workpiece, no matter before or after the adjustment, is larger than that of a qualified one.

关键词： die casting surface defect surface roughness

Role of sirtuins in esophageal cancer:Current status and future prospects

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World Journal of Gastrointestinal Oncology 2022年第4期14卷 794-807页

作者： Ryota Otsuka koichi Hayano Hisahiro Matsubara Department of Frontier Surgery Graduate School of MedicineChiba UniversityChiba 260-8670Japan

Esophageal cancer(EC)is a malignant cancer that still has a poor prognosis,although its prognosis has been improving with the development of multidisciplinary treatment modalities such as surgery,chemotherapy and ***,identifying specific molecular markers that can be served as biomarkers for the prognosis and treatment response of EC is highly desirable to aid in the personalization and improvement of the precision of medical *** are a family of nicotinamide adenine dinucleotide(NAD+)-dependent proteins consisting of seven members(SIRT1-7).These proteins have been reported to be involved in the regulation of a variety of biological functions including apoptosis,metabolism,stress response,senescence,differentiation and cell cycle *** the variety of functions of sirtuins,they are speculated to be associated in some manner with cancer ***,while the role of sirtuins in cancer progression has been investigated over the past few years,their precise role remains difficult to characterize,as they have both cancer-promoting and cancer-suppressing properties,depending on the type of *** conflicting characteristics make research into the nature of sirtuins all the more ***,the role of sirtuins in EC remains unclear due to the limited number of reports concerning sirtuins in *** herein review the current findings and future prospects of sirtuins in EC.

关键词： Esophageal cancer Sirtuin Esophageal squamous cell carcinoma Esophageal adenocarcinoma Biomarker Treatment

Visual acuity after intravitreal ranibizumab with and without laser therapy in the treatment of macular edema due to branch retinal vein occlusion:a 12-month retrospective analysis

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International Journal of Ophthalmology(English edition) 2021年第10期14卷 1565-1570页

作者： Reiko Umeya koichi Ono Toshimitsu Kasuga Department of Ophthalmology Juntendo Tokyo Koto Geriatric Medical CenterTokyo 136-0075Japan Department of Ophthalmology Juntendo University School of MedicineTokyo 113-8421Japan

AIM:To identify factors contributing to visual improvement after treatment of macular edema(ME)secondary to branch retinal vein occlusion(BRVO),and to assess the interaction between laser therapy and intravitreal ranibizumab(IVR).METHODS:We retrospectively reviewed the medical records of patients who had been treated for BRVO-related ME at our *** were traceable for at least 12 mo,and evaluated factors included age,sex,medical history,smoking history,treatment methods,foveal hemorrhage,and change in visual *** included laser therapy,IVR,sub-Tenon’s capsule injection of triamcinolone(STTA),a combination,or no *** logistic regression analysis and interaction terms were used to assess the clinical efficacy of the treatments,and odds ratios(OR)and 95%confidence intervals(CI)were ***:Seventy-three patients(34 men,39 women;73 eyes)with a mean age of 69.4±12.1 y were *** who underwent IVR monotherapy,laser monotherapy,and STTA+laser had significantly higher best corrected visual acuity at 12 mo compared to baseline(P<0.001,<0.001,and 0.019,respectively).Logistic regression analysis without interaction terms found that IVR was a significant visual acuity recovery factor(adjusted OR:3.89,95%CI:1.25-12.1,P=0.019).Adjusted OR using an interaction model by logistic regression was 16.6(95%CI:2.54-108.47,P=0.003)with IVR treatment,and 8.25(95%CI:1.34-50.57,P=0.023)with laser *** interaction was observed(adjusted OR:0.07,95%CI:0.01-0.75,P=0.029).CONCLUSION:IVR contributes to improvements in visual acuity at 12 mo in ME secondary to *** interaction is observed between laser therapy and IVR treatments.

关键词： interaction ranibizumab laser macular edema branch retinal vein occlusion