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Modulation of Twin Tropical Cyclogenesis by the MJO Westerly Wind Burst during the Onset Period of 1997/98 ENSO

Advances in Atmospheric Sciences 2003年第6期20卷 882-898页

作者：祝从文 tetsuo nakazawa 李建平 Chinese Academy of Meteorological Sciences Beijing 100081 LASGInstitute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029 Meteorological Research Institute TsukubaJapan 305-0051 LASG Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029

The modulation of twin tropical cyclogenesis in the Indian-western Pacific Oceans by the Madden-Julian Oscillation (MJO) during the onset period of 1997/98 ENSO is explored for the period of September 1996 to June 1997 based on daily OLR, NCEP/NCAR wind vector, and JTWC best track datasets. The MJO westerly wind burst associated with its eastward propagation can result in a series of tropical cyclogeneses in a multi-day interval. Only in the transition seasons are pairs of tropical cyclones observed in both the tropical sectors of the Indian-western Pacific Oceans. Two remarkable twin tropical cyclogeneses probably modulated by the MJO westerly wind burst are found: one is observed in the Indian Ocean in the middle of October 1996, and the other is observed in the Western Pacific Ocean in late May 1997. The twin tropical cyclogenesis in mid-October 1996 is observed when the super cloud cluster separates into two isolated clusters by the enhanced westerly wind, which is accompanied by two independent vortices in the equatorial tropical sectors. The other one, in late-May 1997, however, is characterized by one cyclonic flow that later results in another cyclonic cell in its opposite equatorial sector. Thus, there are two very important conditions for twin cyclogenesis: one is the MJO westerly wind straddling the equator, and the other is the integral super cloud cluster, which later splits into two cloud convective clusters with independent vortices.

关键词： Madden-Julian oscillation westerly wind burst twin tropical cyclogenesis

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NORTH WESTERN PACIFIC TROPICAL CYCLONE ENSEMBLE FORECAST PROJECT

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Tropical Cyclone Research and Review 2014年第3期3卷 193-201页

作者： MUNEHIKO YAMAGUCHI tetsuo nakazawa SHUNSUKE HOSHINO Meteorological Research Institute of the Japan Meteorological Agency TsukubaJapan World Meteorological Organization GenevaSwitzerland Aerological Observatory Japan Meteorological AgencyTsukubaJapan

The WMO/TCP and WWRP launched the North Western Pacific Tropical Cyclone Ensemble Forecast Project(NWP-TCEFP) in 2009 to explore the utility of ensemble forecasts, including multi-model ensemble forecasts of TCs, and to promote such products for operational TC forecasting. Operational global mediumrange ensembles, which have been exchanged in real-time in a CXML format under the initiative of the WMO GIFS-TIGGE Working Group, have been used to create ensemble products of TC tracks that were used by the Typhoon Committee Members and forecasters participating in the SWFDP in Southeast Asia through a password-protected website developed and maintained by the JMA. In some cases many or all of the ensembles have simultaneously predicted small or large ensemble spreads in TC tracks. The implication is that multi-model ensemble products provide forecasters with additional information on forecast certainty or uncertainty and thus increase the level of confidence in the forecasts. Another important outcome of the project was the responses to surveys conducted by the WMO/TCP and WWRP and also by the WMO GIFS-TIGGE Working Group. The responses confirmed that ESCAP/WMO Typhoon Committee Members have routinely accessed the website and have recognized the usefulness of the ensemble products available on the website for operational TC forecasting.

关键词： tropical cyclone ensemble forecasting THORPEX TIGGE

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大气季节内振荡对印度洋—西太平洋地区热带低压/气旋生成的影响

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气象学报 2004年第1期62卷 42-50页

作者：祝从文 tetsuo nakazawa 李建平中国气象科学研究院北京100081 日本气象研究所中国科学院大气物理研究所LASG 北京100029

文中利用EOF分析大气季节内振荡 (MJO)的时空变化的方法 ,研究了 1996年 9月～ 1997年 6月间的MJO活动对生成在印度洋—西太平洋海域的热带低压 /气旋的影响。结果发现 ,除西北太平洋之外 ,发生在其他区域的热带低压 /气旋有半数以上生... 详细信息

文中利用EOF分析大气季节内振荡 (MJO)的时空变化的方法 ,研究了 1996年 9月～ 1997年 6月间的MJO活动对生成在印度洋—西太平洋海域的热带低压 /气旋的影响。结果发现 ,除西北太平洋之外 ,发生在其他区域的热带低压 /气旋有半数以上生成在向东移动的MJO的湿位相中。伴随MJO的向东传播 ,热带低压 /气旋平均生成位置也随之向东移动 ,而生成在西北太平洋的热带低压

关键词：大气季节内振荡 EOF分析 MJO 时空变化热带低压气旋

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Roadmapping Roadmapping:Strategic planning for roadmapping systems

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Frontiers of Engineering Management 2024年第3期11卷 516-527页

作者： Robert PHAAL Clemens CHASKEL Ricardo GONZALEZ nakazawa Jonathan ROSS Institute for Manufacturing University of CambridgeCambridgeCB30FSUK

Roadmapping is a well-established technique in the context of innovation and strategy,with the potential to support organizations address the complex transformative challenges facing humanity in the 21st *** is enabled by its systems-based architecture and visual form of roadmaps,supporting communication and reduction of information asymmetries in complex sociotechnical *** paper focuses on an adaptation of the roadmapping method to support strategic planning for roadmapping systems in organizations,addressing implementation *** represents a novel application of roadmapping to business processes and systems,demonstrating the flexibility of the roadmapping approach.A workshop template(‘R2’)and process for supporting the roadmapping of roadmapping systems is presented,developed and refined through a series of six industrial cases,and illustrated with an application example in the additive manufacturing sector.

关键词： roadmapping strategic planning innovation management

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Two-photon processes at Belle

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Chinese Physics C 2010年第6期34卷 801-806页

作者： H.nakazawa National Central University

We review recent measurements of pure neutral final state production in the two-photon processes, γγ→π^0π^0 and ηπ^0 at the Belle experiment. In the lower invariant mass region, properties of light scalar mesons are measured by partial wave analysis. In the higher energy region the total and differential cross section are compared with QCD models.

关键词： two-photon cross section resonance

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Recent progress on ultrafast/ultrashort/frequency-stabilized erbium-doped fiber lasers and their applications

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Frontiers of Optoelectronics 2010年第1期3卷 38-44页

作者： Masataka nakazawa Research Institute of Electrical Communication Tohoku University

There are many kinds of fiber lasers in the 1.5 μm band using erbium-doped fiber amplifiers. Our group has been studying and developing advanced fiber lasers, such as 1) 10–40 GHz harmonically mode-locked fiber lasers, 2) femtosecond fiber lasers that use single-wall carbon nanotube（CNT）-doped polymers as a saturable absorber, and 3) frequency-stabilized fiber lasers that employ acetylene C2H2. We will describe recent progress on these fiber lasers and their applications in this article.

关键词： mode-locked erbium fiber laser acetylene frequency-stabilized fiber laser high-speed optical transmission coherent optical transmission

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Local oxynitriding of AZ31 magnesium alloy by atmospheric-pressure plasma treatment at room temperature

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Journal of Magnesium and Alloys 2022年第7期10卷 1878-1886页

作者： Kenta nakazawa Tatsuki Ohashi Shotaro Saiki Shoichi Kikuchi Department of Mechanical Engineering Faculty of EngineeringShizuoka University3-5-1JohokuNaka-kuHamamatsu432-8561Japan Graduate School of Integrated Science and Technology Shizuoka University3-5-1 JohokuNaka-kuHamamatsu432-8561Japan

A surface-hardening treatment for AZ31 magnesium alloy using an atmospheric-pressure plasma jet(APPJ)at room temperature was *** is a potential engineering material because it is lightweight;however,magnesium alloys are difficult to heat-treat because of their low flaming *** alloy specimens were irradiated with a localized atmospheric-pressure plasma jet generated by dielectric-barrier discharge for 180 s in *** APPJ excited oxygen and nitrogen molecules in the ambient air,resulting in the formation of an oxynitrided layer;oxygen and nitrogen diffusion layer,on the surface of the magnesium *** hardness and elemental distribution for the treated surface were *** top surface of the APPJ-treated magnesium alloy achieved a maximum hardness of 108 HV,which was~1.7 times greater than that of the untreated *** analysis using an electron-probe microanalyzer revealed strong oxygen and nitrogen signals corresponding to the hardened region of the magnesium alloy,meaning that the hardness increased as a result of the formation of the oxynitrided *** proposed APPJ treatment is a promising approach for locally hardening magnesium alloys without using a heat treatment.

关键词： Magnesium alloy Oxynitriding Atmospheric-pressure plasma jet Hardness Surface modification Diffusion

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Additive Manufacturing of Metal Micro-ring and Tube by Laser-Assisted Electrophoretic Deposition with Laguerre-Gaussian Beam

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Nanomanufacturing and Metrology 2021年第4期4卷 271-277页

作者： Kenta nakazawa Syunya Ozawa Futoshi Iwata Graduate School of Integrated Science and Technology Shizuoka University3-5-1 Johoku.Naka-kuHamamatsu 432-8561.Japan Graduate School of Medical Photonics Shizuoka University3-5-1 JohokuNaka-kuHamamatsu 432-8011Japan Research Institute of Electronics Shizuoka University3-5-1 JohokuNaka-kuHamamatsu 432-8011Japan

We report a method for laser-assisted electrophoretic deposition using a Laguerre-Gaussian beam for maskless patterning of metal rings and *** are structures of utmost importance,particularly in photonic *** nanoparticles,which are gathered in a colloidal solution by a laser trapping technique,are deposited on a substrate via *** deposition pattern is dependent on the focused spot shape during laser *** intensity distribution of the Laguerre-Gaussian beam is *** with different inner diameters can be fabricated by varying the topological charge of the Laguerre-Gaussian *** equivalent inner diameters of the deposited rings with topological charges of 1,3,and 5 were 0.30,0.78,and 1.45μm,*** inner diameter of the deposited ring with a topological charge of 1 was smaller than the wavelength of the laser beam(532 nm).A tube was also fabricated with a topological charge of 3 by vertical displacement of the deposition *** deposition technology developed here using Laguerre-Gaussian beam will contribute to advancements in the fabrication of photonic and nano-fluidic devices.

关键词： Additive manufacturing Laguerre-Gaussian beam Laser trapping Maskless fabrication Electrophoretic deposition

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Effects of Vertical Angle of Conical Punch on Stretch Flangeability of High Strength Steel

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Acta Metallurgica Sinica(English Letters) 2015年第12期28卷 1503-1509页

作者： Yasuhiro Ito Yoshiaki nakazawa Yukihisa Kuriyama Katsuyuki Suzuk Noriyuki Suzuki Nippon Steel and Sumitomo Metal Corporation The University of Tokyo

To clarify the effects of the vertical angle of a conical punch on stretch flangeability, hole expansion forming tests were conducted. Test results showed that the hole expansion ratio becomes larger as the vertical angle *** also showed that the fracture strain at the fracture location on the hole edge was constant and independent of the vertical angle. This is because the hole expansion ratio was controlled not only by the fracture strain, which is independent of the vertical angle, but also by deformation uniformity along the hole edge. From the result of numerical analyses, it was determined that deformation uniformity depends on the gradient of circumferential stress along the radius direction. When the vertical angle is sharp, the circumferential stress showed a steep decline and the deformation localization was suppressed. Consequently, the hole edge deformed more uniformly and the hole expansion ratio became larger. It is concluded that in order to improve stretch flangeability of high strength steel, it is important to uniformly deform the hole edge by applying a conical punch with a sharp vertical angle.

关键词： Formability Ductile fracture Finite element analysis Hole expansion test

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Effect of roselle calyx extract on in vitro viability and biofilm formation ability of oral pathogenic bacteria

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Asian Pacific Journal of Tropical Medicine 2016年第2期9卷 115-120页

作者： Herastuti Sulistyani Mari Fujita Hiroshi Miyakawa Futoshi nakazawa Department of Oral Microbiology School of Dentistry Health Sciences University of Hokkaido

Objective: To investigate the effect of the roselle calyx extract(RCE)(Hibiscus sabdariffa L.) on the in vitro viability and biofilm formation ability of oral pathogenic bacteria. Methods:RCE was prepared by soaking roselle calyx powder with ethyl alcohol for 24 h at room temperature. After centrifugation, the extract was lyophilized. Then, the extract was dissolved in phosphate-buffered saline, the p H was adjusted, and the extract was aseptically filtered. We used Streptococcus mutans, Streptococcus sanguinis, Lactobacillus casei, Actinomyces naeslundii, Aggregatibacter actinomycetemcomitans, Fusobacterium nucleatum, Porphyromonas gingivalis and Prevotella intermedia in this study. The antibacterial activity of the RCE was determined by treating the cells of these bacteria with the extract for 10 or 20 min at room temperature. The minimum inhibitory concentration(MIC) and minimum bactericidal concentration was determined using the micro dilution method, and the effect of the RCE on the ability to form biofilm was determined using a polystyrene micro plate assay. In addition, we used the WST-1 assay to determine the cytotoxicity of the RCE on HGF, Ca9-22 and KB cells. Results: The RCE had antibacterial activity against oral bacteria used in this study. In particular, most significant antibacterial activity was observed against Fusobacterium nucleatum, Prevotella intermedia and Porphyromonas gingivalis. The MIC and minimum bactericidal concentration were 7.2 mg/m L–28.8 mg/m L and 14.4 to >57.6 mg/m L. The RCE had an inhibitory effect on biofilm formation at the MIC and sub-MIC levels. In addition, the RCE had low cytotoxic effects on HGF, Ca9-22 and KB cells. Conclusions: Thus, our results indicate that the RCE may be used for preventing oral diseases.

关键词： Oral bacteria Oral biofilm Oral cells Roselle calyx extract

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