Numerical Study of Blade-Vortex Interaction (BVI) Noise Capturing

Tanabe, Yasutada,Saito, Shigeru,Takasaki, Keisuke,Fujita, Hajime The Korean Society for Aeronautical and Space Scie 2008 International Journal of Aeronautical and Space Sc Vol.9 No.2

The noise is one of the serious problems concerning helicopters operations. The issue of helicopter external noise generated mainly from a helicopter rotor has always affected the use of rotorcrafts, especially in the urban environment. The noise sources depend on the flight configurations. In particular, a noise generated by the interaction between blades and tip vortices mainly occurs during descent flight. This noise is called blade-vortex interaction (BVI) noise, and this BVI noise is particularly penalizing for helicopters. In this paper, a numerical study to capture the BVI noise is carried out. The numerical study is performed in two phases. In the first phase, a 2D simulation based on parallel BYI event of Kitapliglu et al experiment is performed. In the second phase, 3D simulation based on HART Ⅱ experiment is performed. Several experimental data such as thrust, torque, blade sectional load, its derivative and vortex location are compared with calculation results and the comparison showed reasonably good agreement.

거주환경의 쾌적성 연구동향 - Thermal Manikin과 인체 모델 -

Tanabe, Shinichi 대한설비공학회 2010 설비저널 Vol.39 No.10

Persistent Organochlorines in Japanese Coastal Waters : An Introspective Summary from A Far East Developed Nation

Tanabe, Shinsuke,Tatsukawa, Ryo 경남대학교 환경문제연구소 1989 환경연구 Vol.11 No.-

Japan has emarged as a leading industrialized nation and an economic power in the world scene from the Far East. The rapid modernization and industrial growth have also left behind marks of environmental deterioration and incidents of human health effects. Considering organochlorine contaminants such as PCB, DDT arid HCH as markers of environmental quality, this introspective review examines the coastal health of Japan. A case study on these compounds in Seto-Inland Sea region in Japan revealed that the environmental load of persistent organochlorines, as typified by PCB is in coastal sediments. Temporal observations on these compounds in Japanese environment indicate that these classical pollutants have gradually decreased through years after restricting their usage. However, new environmental challenges are also recognized. Compounds such as Chlordane, TDCPP, PCDDs, PCDFs and coplanar PCBs still contaminate Japanese coastline. Environmental impact of exceptionally toxic PCDDs, PCDFs and related compounds in under strutinization.

Resonant neutral particle emission in collisions of electrons with protonated peptides with disulfide bonds at high energies

Tanabe, Tetsumi,Noda, Koji,Miyagi, Satoshi,Kurita, Noriyuki,Tanaka, Shigenori,Setzler, Julia,Wenzel, Wolfgang,Starikov, Evgeni B.,Cuniberti, Gianaurelio Elsevier 2011 Chemical physics letters Vol.504 No.1

<P><B>Graphical abstract</B></P><P><ce:figure id='f0025'></ce:figure></P><P><B>Research highlights</B></P><P>► Electron–monocation collisions for peptides with and without disulfide bonds. ► Resonant neutral particle emissions were observed at 6–7eV. ► The presence of disulfide bonds tends to enhance the resonant bump heights.</P> <P><B>Abstract</B></P><P>Electron–ion collisions were studied for various protonated peptide monocations with disulfide bonds, using an electrostatic storage-ring equipped with a merged-electron-beam device. Resonant neutral particle emissions at the energies of 6–7eV were observed, as well as a rise towards zero-energy, which are typical electron-capture dissociation profiles. The presence of disulfide (S–S) bonds tends to enhance the resonant bump heights. Chemical nature of the amino-acid residues adjacent to cysteines appears to correlate with the bump strength. Molecular-dynamical simulations help clarify the role of molecular vibration modes in the electron-capture dissociation process.</P>

Atypical protein kinase C regulates primary dendrite specification of cerebellar Purkinje cells by localizing Golgi apparatus.

Tanabe, Koji,Kani, Shuichi,Shimizu, Takashi,Bae, Young-Ki,Abe, Takaya,Hibi, Masahiko The Society 2010 The Journal of neuroscience Vol.30 No.50

<P>Neurons have highly polarized structures that determine what parts of the soma elaborate the axon and dendrites. However, little is known about the mechanisms that establish neuronal polarity in vivo. Cerebellar Purkinje cells extend a single primary dendrite from the soma that ramifies into a highly branched dendritic arbor. We used the zebrafish cerebellum to investigate the mechanisms by which Purkinje cells acquire these characteristics. To examine dendritic morphogenesis in individual Purkinje cells, we marked the cell membrane using a Purkinje cell-specific promoter to drive membrane-targeted fluorescent proteins. We found that zebrafish Purkinje cells initially extend multiple neurites from the soma and subsequently retract all but one, which becomes the primary dendrite. In addition, the Golgi apparatus specifically locates to the root of the primary dendrite, and its localization is already established in immature Purkinje cells that have multiple neurites. Inhibiting secretory trafficking through the Golgi apparatus reduces dendritic growth, suggesting that the Golgi apparatus is involved in the dendritic morphogenesis. We also demonstrated that in a mutant of an atypical protein kinase C (aPKC), Prkci, Purkinje cells retain multiple primary dendrites and show disrupted localization of the Golgi apparatus. Furthermore, a mosaic inhibition of Prkci in Purkinje cells recapitulates the aPKC mutant phenotype. These results suggest that the aPKC cell autonomously controls the Golgi localization and thereby regulates the specification of the primary dendrite of Purkinje cells.</P>

Longer prolapsed rectum length increases recurrence risk after Delorme’s procedure

Tanabe Taro,Yamaguchi Emi,Nakada Takuya,Nishio Risa,Okamoto Kinya,Yamana Tetsuo 대한대장항문학회 2022 Annals of Coloproctolgy Vol.38 No.4

Purpose: Risk factors for recurrence of rectal prolapse after surgery remain unclear. Delorme’s procedure is often selected for relatively small-sized rectal prolapse, but there are few reports discussing the association between prolapsed rectum length and prolapse recurrence after Delorme’s procedure. We hypothesized that patients with longer rectal prolapses are at a higher risk of recurrence after Delorme’s procedure. Methods: The study population comprised patients with rectal prolapse who underwent Delorme’s procedure between January 2014 and December 2019 at Tokyo Yamate Medical Center. We extracted data on patient age, sex, body mass index, previous history of anal surgery, previous history of surgery for rectal prolapse, and length of prolapse, to identify risk factors for prolapse recurrence. Results: Altogether, 96 patients were eligible for analysis. The median length of the prolapsed rectum was 3.0 cm (range, 1.0–6.6 cm). Twenty-four patients (25.0%) experienced recurrence after Delorme’s procedure after a median of 7.5 months (interquartile range, 3.2–20.9 months). Multivariate analysis revealed that longer prolapsed rectum length increased the risk of recurrence after Delorme’s procedure (hazard ratio, 6.28; 95% confidence interval, 1.83–21.50; P<0.001). Conclusion: The length of the prolapsed rectum should be measured before Delorme’s procedure for rectal prolapse, because length is associated with a risk of recurrence after the surgery.

PRODUCTION, EVOLUTION AND REPRODUCTIVE ENDOCRINOLOGY OF DUCKS

Tanabe, Y. Asian Australasian Association of Animal Productio 1992 Animal Bioscience Vol.5 No.1

Duck is an important domestic animal, especially in Asia. Eighty five percent of ducks in the world are kept in Asia, especially in the East and South Asia regions. The ancestor of domesticated ducks was mallard (Anas platylhynchos), which are still migrating between north and southern parts in Eurasia. Ducks have been domesticated in China for at least 3000 years ago. Phylogenetic studies on ducks, employing electrophoresis of blood proteins, indicate a marked difference of genetic constitution between duck breeds in southeast Asia and those in northeast Asia. Duck embryonic ovary is much more active in secretion of sex steroid hormones especially estradiol than the embryonic testes. Estradiol secreted by the embryonic left ovary has an important role in female sexual differentiation in ducks. In the female ducks, plasma LH, estradiol and testosterone levels increase and reach peaks shortly before the first egg, while progesterone level reach a peak shortly after the first egg. In laying ducks oviposition mostly occurs in the last 3 hr of darkness and first hr of light ranging 02:00-06:00 under 14 hr light (05:00-19:00) and 10 hr darkness photoperiodic condition. Measurements of plasma hormone levels reveal that onset of darkness is a major signal for LH release from the pituitary and the subsequent release of progesterone from ovary, and for induction of ovulation in the female duck.

Investigation of the Downwash Induced by Rotary Wings in Ground Effect

Tanabe, Yasutada,Saito, Shigeru,Ooyama, Naoko,Hiraoka, Katsumi The Korean Society for Aeronautical and Space Scie 2009 International Journal of Aeronautical and Space Sc Vol.10 No.1

There are concerns about the influence of the gust wind caused by helicopters affecting the moving vehicles while hovering over the road during rescue activities. For the understanding of such complicated flow. numerical simulation of a rotor hovering above the ground has been carried out, changing the rotor/ground clearances. The rotor thrust is kept constant. and the rotor control is determined by trim adjustments incorporated into the CFD algorithm. Collective pitch angle and the required power decreases with the rotor/ground clearance which agrees with experience. Changes of the flowfield near the rotor with regard to the rotor height are investigated based on the calculated results.

An Architecture of Group MODEM with Timesharing Processing for Satellite Communication Networks

Tanabe, Kazuhiro,Sagawa, Yuichi,Kobayashi, Kiyoshi,Ohata, Kohei,Ueba, Masazumi 통신위성우주산업연구회 2002 Joint Conference on Satellite Communications Vol.2002 No.-

A satellite communication system for a mesh type network must support many multi-point connections simultaneously, and allocate satellite channels with the required data rates to support each connection independently. The conventional approach is excessively expensive since it forces the earth station to have one single carrier modem for each connection. To eliminate this problem, we introduce the Multicarrier/Multirate Group MODEM for earth stations. This new MODEM is implemented as a single LSI chip. The current version supports up to 128 communication channels simultaneously, and the bandwidth of each communication channel can be set individually. This paper describes the architecture and processing method of the modem and proposes an algorithm that decreases buffer circuit so as to reduce circuit size. Performance evaluation results are shown.

Multicarrier/Multirate modem providing channel de-assemble and assemble functions

Tanabe, Kazuhiro,Kobayashi, Kiyoshi,Ohata, Kohei,Ueba, Masazumi 통신위성우주산업연구회 2001 Joint Conference on Satellite Communications Vol.2001 No.-

A satellite communication system for enterprise Intranets must be able to support simultaneous multi-point connections among dispersed locations and to allocate satellite channels with the required data rates of each of the connections independently. To meet these requirements, the Multicarrier/Multirate Group Modem (MCMRM) for earth stations is proposed that can process multiple and various rate. MCMRM has the following features. 1. Supports simultaneous communications with hundreds of channels. (Maximum 768) 2. The prototype modem is roughly the same size of as the conventional single carrier modem. 3. To secure flexibility and scalability, the developed modem consists of independent modules. 4. Supports the allocation of bandwidth required over dispersed frequency bands, even if continuous frequency band is not available. MCMRM consists of a multi-rate filter bank and a group modem implemented on several FPGAs controlled by a timesharing system. Evaluations show that MCMRM has even higher BER performance than a conventional single carrier modem. This paper describes the architecture and processing method of MCMRM and performance evaluation results.