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Exciton diffusion in near-infrared absorbing solution-processed organic thin films
Shin, H.-Y.,Woo, J. H.,Gwon, M. J.,Barthelemy, M.,Vomir, M.,Muto, T.,Takaishi, K.,Uchiyama, M.,Hashizume, D.,Aoyama, T.,Kim, D.-W.,Yoon, S.,Bigot, J.-Y.,Wu, J. W.,Ribierre, J. C. The Royal Society of Chemistry 2013 Physical chemistry chemical physics Vol.15 No.8
<P>We report on singlet–singlet annihilation and exciton diffusion in as-prepared p-type and annealed n-type thin films of the low-bandgap quinoidal quaterthiophene [QQT(CN)4] using ultrafast transient absorption measurements. The decay dynamics of exciton populations are well described by a one-dimensional diffusion-limited bimolecular recombination, indicating that the singlet excitons migrate preferentially along the stacking direction. Our results show that the exciton diffusion constants in QQT(CN)4 films do not vary significantly upon thermal annealing. Exciton diffusion lengths are measured to be as high as 4 and 5 nm in as-prepared and annealed QQT(CN)4 films, respectively. We also observe an influence of the excitation densities on the singlet exciton diffusion, which is attributed to phonon scattering. Because of the possibility of patterning p–n regions in QQT(CN)4 films by thermal nanolithography techniques, this study provides important insight not only into the photophysical properties of quinoidal oligothiophene derivatives but also for their future integration into high-performance p–n nanostructured near infrared light-sensing devices.</P> <P>Graphic Abstract</P><P>Exciton–exciton annihilation and exciton diffusion processes are investigated by femtosecond transient absorption in as-prepared p-type and annealed n-type thin films of the quinoidal quaterthiophene [QQT(CN)4]. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c2cp43705h'> </P>
Measurement of neutrino oscillation by the K2K experiment
Ahn, M. H.,Aliu, E.,Andringa, S.,Aoki, S.,Aoyama, Y.,Argyriades, J.,Asakura, K.,Ashie, R.,Berghaus, F.,Berns, H. G.,Bhang, H.,Blondel, A.,Borghi, S.,Bouchez, J.,Boyd, S. C.,Burguet-Castell, J.,Casper, American Physical Society 2006 PHYSICAL REVIEW D - Vol.74 No.7
Realization of Musical Saw Bowing by Industrial Humanoid Robot
H. Hanai,A. Mishima,A. Miura,T. Hirogaki,E. Aoyama 제어로봇시스템학회 2021 제어로봇시스템학회 국제학술대회 논문집 Vol.2021 No.10
In a previous study, we examined the performance of musical saw bows using a western saw, which is not only an unfamiliar tool but also difficult to handle owing to its excellent shape and flexibility among various musical instruments. In the previous study, we achieved performance control by blowing; however, we could not control the sound other than blowing. In this study, we focused on bowing, which is used in the evaluation of musical saw performance, in addition to striking. Moreover, self-excited vibrations must be generated by stick-slip based on the performance. Consequently, the pressure and velocity must be controlled to verify the generation of the self-excited vibration and the vibration itself. In addition to the generation of sound by a self-excited vibration, this study discusses the pure sound nature of the vibration. This approach differs from those implemented in previous studies to suppress the self-excited vibration. Furthermore, we present a method to realize the musical saw movement using an industrial humanoid robot.
Velusamy, D.B.,Kim, R.H.,Takaishi, K.,Muto, T.,Hashizume, D.,Lee, S.,Uchiyama, M.,Aoyama, T.,Ribierre, J.C.,Park, C. Elsevier Science 2014 Organic electronics Vol.15 No.11
Polymer ferroelectric-gate field effect transistors (Fe-FETs) employing ferroelectric polymer thin films as gate insulators are highly attractive as a next-generation non-volatile memory. For minimizing gate leakage current of a device which arises from electrically defective ferroelectric polymer layer in particular at low operation voltage, the materials design of interlayers between the ferroelectric insulator and gate electrode is essential. Here, we introduce a new solution-processed interlayer of conductive reduced graphene oxides (rGOs) modified with a conjugated block copolymer, poly(styrene-block-paraphenylene) (PS-b-PPP). A FeFET with a solution-processed p-type oligomeric semiconducting channel and ferroelectric poly(vinylidene fluoride-co-trifluoroethylene) (PVDF-TrFE) insulator exhibited characteristic source-drain current hysteresis arising from ferroelectric polarization switching of a PVDF-TrFE insulator. Our PS-b-PPP modified rGOs (PMrGOs) with conductive moieties embedded in insulating polymer matrix not only significantly reduced the gate leakage current but also efficiently lowered operation voltage of the device. In consequence, the device showed large memory gate voltage window and high ON/OFF source-drain current ratio with excellent data retention and read/write cycle endurance. Furthermore, our PMrGOs interlayers were successfully employed to FeFETs fabricated on mechanically flexible substrates with promising non-volatile memory performance under repetitive bending deformation.
Alkam, T.,Mamiya, T.,Kimura, N.,Yoshida, A.,Kihara, D.,Tsunoda, Y.,Aoyama, Y.,Hiramatsu, M.,Kim, H. C.,Nabeshima, T. Springer Science + Business Media 2017 Psychophamacology Vol.234 No.12
<P>Increased risk of attention-deficit/hyperactivity disorder (AD/HD) is partly associated with the early developmental exposure to nicotine in tobacco smoke. Emerging reports link tobacco smoke exposure or prenatal nicotine exposure (PNE) with AD/HD-like behaviors in rodent models. We have previously reported that PNE induces cognitive behavioral deficits in offspring and decreases the contents of dopamine (DA) and its turnover in the prefrontal cortex (PFC) of offspring It is well known that the dysfunction of DAergic system in the brain is one of the core factors in the pathophysiology of AD/HD. Therefore, we examined whether the effects of PNE on the DAergic system underlie the AD/HD-related behavioral changes in mouse offspring. PNE reduced the release of DA in the medial PFC (mPFC) in mouse offspring. PNE reduced the number of tyrosine hydroxylase (TH)-positive varicosities in the mPFC and in the core as well as the shell of nucleus accumbens, but not in the striatum. PNE also induced behavioral deficits in cliff avoidance, object-based attention, and sensorimotor gating in offspring. These behavioral deficits were attenuated by acute treatment with atomoxetine (3 mg/kg, s.c.) or partially attenuated by acute treatment with MPH (1 mg/kg, s.c.). Taken together, our findings support the notion that PNE induces neurobehavioral abnormalities in mouse offspring by disrupting the DAergic system and improve our understanding about the incidence of AD/HD in children whose mothers were exposed to nicotine during their pregnancy.</P>