382 research outputs found
A comparison of Landau-Ginzburg models for odd-dimensional Quadrics
No full textIn [Rie08], the second author defined a Landau-Ginzburg model for homogeneous spaces G/P, as a regular function on an affine subvariety of the Langlands dual group. In this paper, we reformulate this LG model (X^, W_t) in the case of the odd-dimensional quadric, as a rational function on a Langlands dual projective space, in the spirit of work by R. Marsh and the second author for type A Grassmannians and by both authors for Lagrangian Grassmannians. We also compare this LG model with the one obtained independently by Gorbounov and Smirnov, and we use this comparison to deduce part of a conjecture of the second author for odd-dimensional quadrics
Kentaro Sasaki : Physical education teacher belonged to Kinan-Sakkyou : His joining in Kinan・Sakkyou
No full textKentaro Sasaki, the author of "Taiiku-no-ko" had made many famous P.E.practices as a teacher of junior high school and high school at Kinan district since the end of the World War2.The features of his practices are ; 1) using compositions as educational method, 2) combining with educational guidance, 3) starting from reality of children's bodies and minds, and so on. This study attempts to clarify the process of his joining in Kinan-Sakkyou and the way to use compositions to practices anal- yzing his articles and "Kinan Kyoiku" which were bulletins of Kinan-Sakkyou
Genecialist manifesto: overcoming the “class struggle” in medicine
No full textKentaro Iwata Division of Infectious Diseases, Kobe University Hospital, Kobe, Hyogo, Japan Abstract: Generalists and specialists are often considered two completely distinct species, which culminates in the establishment of a concept of dichotomy. However, these dichotomy can at times fuel tension and even erupt into open conflict. In order to resolve this issue, the author herein proposes the concept of a “genecialist.” The genecialist refers to a hybrid comprising elements inherent to both generalists and specialists. This potentially overcomes the multitude of issues associated with both generalists and specialists in the practical aspects of medicine. The coalescence of these two contrarieties may hold the key to improving the future of health care. Mediating and integrating both categories into one consolidated entity carries the potential to stem the tide of class warfare between generalists and specialists. Keywords: genecialist, aufheben, generalist, specialist, asymmetr
WQ-3810 exerts high inhibitory effect on quinolone-resistant DNA gyrase of Salmonella Typhimurium
No full textThe inhibitory effect of WQ-3810 on DNA gyrase was assayed to evaluate the potential of WQ-3810 as a candidate drug for the treatment of quinolone resistant Salmonella Typhymurium infection. The inhibitory effect of WQ-3810, ciprofloxacin and nalidixic acid was compared by accessing the drug concentration that halves the enzyme activity (IC50) of purified S. Typhimurium wildtype and mutant DNA gyrase with amino acid substitution at position 83 or/and 87 in subunit A (GyrA) causing quinolone resistance. As a result, WQ-3810 reduced the enzyme activity of both wildtype and mutant DNA gyrase at a lower concentration than ciprofloxacin and nalidixic acid. Remarkably, WQ-3810 showed a higher inhibitory effect on DNA gyrase with amino acid substitutions at position 87 than with that at position 83 in GyrA. This study revealed that WQ-3810 could be an effective therapeutic agent, especially against quinolone resistant Salmonella enterica having amino acid substitution at position 87. (Up to 150 words
Cut-elimination, substitution and normalisation
No full textDate of Acceptance: 01/2015We present a proof (of the main parts of which there is a formal version, checked with the Isabelle proof assistant) that, for a G3-style calculus covering all of intuitionistic zero-order logic, with an associated term calculus, and with a particular strongly normalising and confluent system of cut-reduction rules, every reduction step has, as its natural deduction translation, a sequence of zero or more reduction steps (detour reductions, permutation reductions or simplifications). This complements and (we believe) clarifies earlier work by (e.g.) Zucker and Pottinger on a question raised in 1971 by Kreisel.Peer reviewe
The Effectiveness of Community-Based Development in Poverty Reduction : A Descriptive Analysis of a Women-Managed NGO in Rural Pakistan
No full textTo assess the targeting performance of community-based development activities and deduce the impact of such activities on poverty reduction, we implemented a survey of a non-governmental organization (NGO) in northwestern Pakistan. A distinct characteristic of this NGO is that it is managed mostly by women and its interventions are conducted through community-based organizations (COs), most of whose members are also female. This characteristic is rather unusual for a male-dominated society like Pakistan. Descriptive analyses of village, CO, and household level data shows that the NGO was able to target poorer villages. Villages with COs are characterized by lower adult literacy rates, lower availability of basic amenities, and higher susceptibility to natural disasters. With regard to household-level welfare indicators -- such as consumption, women’s empowerment, children’s school enrolment, and the weight-for-age of infants -- we found that the consumption levels of CO member households tended to be lower than that of households in non-CO villages. However, the difference between CO member households and non-member households in CO villages was insignificant, possibly owing to the mixing of the selection effect (i.e., poorer households are served by the NGO) and the causal effect of interventions on poverty reduction. On women’s empowerment and child schooling, CO member households tend to perform better than other households, suggesting the favorable impact of the interventions and/or the self-selection of such households vis-à-vis program participation.
A new model construction by making a detour via intuitionistic theories II: Interpretability lower bound of Feferman's explicit mathematics T0
No full textWe partially solve a long-standing problem in the proof theory of explicit mathematics or the proof theory in general. Namely, we give a lower bound of Feferman’s system T0 of explicit mathematics (but only when formulated on classical logic) with a concrete interpretat ion of the subsystem Σ12-AC+ (BI) of second order arithmetic inside T0. Whereas a lower bound proof in the sense of proof-theoretic reducibility or of ordinalanalysis was already given in 80s, the lower bound in the sense of interpretability we give here is new. We apply the new interpretation method developed by the author and Zumbrunnen (2015), which can be seen as the third kind of model construction method for classical theories, after Cohen’s forcing and Krivine’s classical realizability. It gives us an interpretation between classical theories, by composing interpretations between intuitionistic theories
Spectroscopy and external control of optical dynamics in single semiconductor nanocrystals
No full textThesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemistry, 2002.Includes bibliographical references.This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.Single molecule spectroscopy has progressed substantially in the past ten years and the accompanying progress in the optical study of single semiconductor nanocrystals has opened a new dimension in our understanding of the photophysical properties of these quantum-confined materials. In this thesis, I describe experimental advances that investigate and manipulate optical dynamics--blinking and spectral diffusion--in single CdSe and CdTe nanocrystals caused by complex interactions of electric fields and charge migration between a nanocrystal and its nearby environment. With the aid of a simple yet powerful fluorescence far-field microscope, we examine the blinking phenomenon using statistical analysis to determine a temperature-independent physical mechanism (charge tunneling) that is universal to every nanocrystal. Furthermore, we uncover a strong correlation between the blinking and spectral diffusion processes. This correlation proves to be critical in connecting the power-law statistics observed from blinking in isolated nanocrystals with the binary spectral shifts in surface plasmon coupled nanocrystals. Moreover, we identify charged nanocrystal emission signatures and create charged nanocrystals on command. This level of control, whether to turn the nanocrystals off or to eliminate the blinking behavior, also improves the prospects for nanocrystal device applications. Finally, we explore the impact of external magnetic fields on single nanocrystal optical properties and reveal behavior that is dependent on nanocrystal orientations relative to the applied field. In addition, we observe evidence of zero-field splitting in a subset of nanocrystals. This corroborates theoretical models that propose paramagnetic interactions as an explanation for the fundamental physics of CdSe nanocrystal emission.by Kentaro Shimizu.Ph.D
Bid-Based Priority Signal Control in a Connected Environment
No full textDemand-responsive traffic signal control, like actuated signal control and adaptive traffic signal control, aims to provide efficient movements to road users. Although traffic control signals often treat vehicles as homogeneous objects, in reality road users��� value of time (VOT) may vary depending on their situation. However, little research has been conducted in signal control methods that account for individual differences in VOT. This research introduces the concept of a bid-based priority signal control (BBPSC), a traffic signal control method that considers individual differences in VOT via bids. Within BBPSC, drivers can bid for a green signal indication in a connected environment. In the first phase of research, the author addressed key elements of such a concept. In asymmetric simple exclusion process (ASEP) with two conflicting movements, an algorithm extended a green interval as long as the cumulative opportunity loss observed in stopped movements remained less than the value that would have been lost through the termination of that green interval. BBPSC prioritized high bidders and resulted in a greater subjective user benefit compared to a pre-timed equivalent. In the second phase, the applicability of BBPSC was further investigated with a four-phase signal controller using microsimulations in PTV Vissim.
While BBPSC produced approximately 70 percent longer queues than non-bid-based priority signal control (NBBPSC) in undersaturated conditions, the new control method achieved a smaller delay for high bidders on average, providing user benefit for high bidders. Extremely high bidders experienced a more than 90 percent decrease in delays with BBPSC when measured against NBBPSC. These results proved that typical four-phase traffic control signals can be operated by an algorithm based on bids from road users. Future work should investigate the optimal values of key input variables of BBPSC, especially in highly saturated traffic conditions.
* Part of this section is reprinted with permission from ���Bid-Based Priority Signal Control in a Connected Environment: Concept��� by Iio, Kentaro, Yunlong Zhang, and Luca Quadrifoglio, 2019. Transportation Research Record: Journal of the Transportation Research Board, https://doi.org/10.1177/0361198119855981, Copyright 2019 Sage Publications, Incorporated
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