Field Analysis of SF(6) Gas Insulated Cables and Its Application to Spacer Design

This paper describes the spacer design for SF(6) gas insulated cables. The maximum electric stress within the cable is calculated by a numerical method, and it is recognized that the breakdown voltage depends linearly on the calculated values. Moreover, the effects of varying the shape of the spacer are made clear in this study for designing an optimum spacer

ヤクスギの年輪による気候復元モデルの構築

Open House, ISM in Tachikawa, 2017.6.16統計数理研究所オープンハウス（立川）、H29.6.16ポスター発

ヤクスギの年輪からわかること

Open House, ISM in Tachikawa, 2016.6.17統計数理研究所オープンハウス（立川）、H28.6.17ポスター発

ゼロ過剰ポアソン回帰モデルに基づく稚樹の切株・倒木上更新解析

Open House, ISM in Tachikawa, 2018.6.15統計数理研究所オープンハウス（立川）、H30.6.15ポスター発

Gouvernance Institutionnelle De La Redd+ En Republique Democratique Du Congo: Diagnostic Et Proposition Des Voies d’Amélioration

La République démocratique du Congo est l’un des pays leaders engagés, depuis 2009, au mécanisme de réduction des émissions dues à la déforestation et de la dégradation des forêts, la "REDD+". Cet engagement s’est matérialisé notamment par la mise en place d’un arrangement institutionnel chargé de mise en œuvre, de suivi et évaluation de ce processus. Ceci traduit la volonté  du pays, dont plus de 90% des émissions de GES proviennent du secteur des forêts, de faire de la REDD+ une question transversale et intégrante dans  toutes les politiques publiques nationales. Cependant, en dépit de la convergence de leurs missions,  ces structures fonctionnent de façon déconnectée et  indépendante avec une parcelle de collaboration qui se développe difficilement. Bref, des disfonctionnements institutionnels qui réduisent les perspectives d’atteinte des objectifs climatiques du pays. Ainsi, le présent article procède au diagnostic de l’arrangement institutionnel de la REDD+ en RDC afin de proposer les voies de son amélioration.La République démocratique du Congo est l’un des pays leaders engagés, depuis 2009, au mécanisme de réduction des émissions dues à la déforestation et de la dégradation des forêts, la "REDD+". Cet engagement s’est matérialisé notamment par la mise en place d’un arrangement institutionnel chargé de mise en œuvre, de suivi et évaluation de ce processus. Ceci traduit la volonté  du pays, dont plus de 90% des émissions de GES proviennent du secteur des forêts, de faire de la REDD+ une question transversale et intégrante dans  toutes les politiques publiques nationales. Cependant, en dépit de la convergence de leurs missions,  ces structures fonctionnent de façon déconnectée et  indépendante avec une parcelle de collaboration qui se développe difficilement. Bref, des disfonctionnements institutionnels qui réduisent les perspectives d’atteinte des objectifs climatiques du pays. Ainsi, le présent article procède au diagnostic de l’arrangement institutionnel de la REDD+ en RDC afin de proposer les voies de son amélioration

Modulation Index Variation Effect on Harmonic Behavior of Fifteen Multilevel Inverter Neutral-Point-Clamped Topology

The Market for photovoltaic cells (PV) has grown fast due to a higher demand on PV applications. However, there are still the transport and connection problems of the PV systems to the grid because of the difference in the current form. To assure the adequate connection between the PV sources and the network, the conversion of direct current (DC) to an alternative current (AC) is required and provided by an electronic device known as the inverter. In this last years, the conventional inverter structure reached its limits in power level and conversion performance. The multilevel inverter (MLI) structure was introduced and widely used in high power and high voltage applications to solve the conventional inverter limitation problem. In this paper, the Neutral-Point-Clamped (NPC) topology of the MLI was simulated to evaluate the effect of modulation index variation of the control technique on the harmonic behavior of the fifteen-level NPC. The simulation results were useful for the optimization of the MLI control technique toward the decrease of the harmonic (THD) effect on the NPC MLI

Test of the overreaction hypothesis in the South African stock market

>Magister Scientiae - MScThis research undertakes to investigate both long-term and short-term investor overreaction on the JSE Limited (JSE) over the period from 1 January 2002 to 31 December 2009. The period covers the restructuring and reform of the JSE in the early 2000s to the end of global financial market crisis in late 2008/2009, which can be regarded as a complete economic cycle. The performances of the winner and loser portfolios are evaluated by assessing their cumulative abnormal returns (CAR) over a 24-month holding period. The test results show no evidence of mean reversion for winner and loser portfolios formed based on prior returns of 12 months or less. However, test results show evidence of significant mean reversion for the winner and loser portfolios constructed based on their prior 24 months and 36 months returns. In addition, the study reveals that the mean reversion is more significant for longer-formation-period portfolios as well as for longer holding periods. The examination of the cumulative loser-winner spreads obtained from the contrarian portfolios based on the constituents’ prior 24 month and 36 month returns indicates that the contrarian returns increase for portfolios formed between 2004 and 2006, and declines thereafter towards the end of the examination period. The deterioration of contrarian returns coincides with the subprime mortgage crisis in 2007 and the subsequent global financial crisis in 2008. This evidence suggests that the degree of mean reversion on the JSE is positively correlated to the South African business cycle

Asymmetric Field Profile in Bose Glass Phase of Irradiated YBa2Cu3O7-d: Loss of Interlayer Coherence around 1/3 of Matching Field

Magneto-optical imaging in YBa2Cu3O7-d with tilted columnar defects (CD's) shows an asymmetric critical-state field profile. The observed hysteretic shift of the profile ridge (trough) from the center of the sample is explained by in-plane magnetization originated from vortex alignment along CD's. The extracted ratio of the in-plane to out-of-plane magnetization component has a maximum at 1/5 of matching field ($B_\Phi$) and disappears above $B_\Phi/3$, suggesting a reduction of interlayer coherence well bellow $B_\Phi$ in the Bose glass phase. Implications are discussed in comparison with the vortex liquid recoupling observed in irradiated Bi2Sr2CaCu2O8+y.Comment: Revtex, 4 pages, 5 figures, also see a movie at (http://www.ap6.t.u-tokyo.ac.jp/kitaka/Research/d-line/index_e.htm). This manuscript will appear in Phys. Rev. Let

Efficient Messenger RNA Delivery to the Kidney Using Renal Pelvis Injection in Mice

Renal dysfunction is often associated with the inflammatory cascade, leading to non-reversible nephrofibrosis. Gene therapy has the ability to treat the pathology. However, the difficulty in introducing genes into the kidney, via either viral vectors or plasmid DNA (pDNA), has hampered its extensive clinical use. Messenger RNA (mRNA) therapeutics has recently attracted attention as alternative gene therapies. mRNA allows protein production into post-mitotic cells without the need for transport to the nuclei in the target cells. However, few studies have reported the delivery of mRNA to the kidney. In this study, we attempted to deliver mRNA to the kidney based on the principle of pressure stimulation, by administering mRNA-loaded polyplex nanomicelles via a renal pelvis injection, directly into the kidney. Compared with the administration of naked plasmid DNA (pDNA) and naked mRNA, the mRNA-loaded nanomicelles diffusely induced protein expression in a greater number of cells at the tubular epithelium for some days. The plasma creatinine (Cre) and blood urea nitrogen (BUN) levels after the administration remained similar to those of the sham-operated controls, without marked changes in histological sections. The safety and efficacy of mRNA-loaded nanomicelles would make distinct contributions to the development of mRNA therapeutics for the kidney