ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNew aspects of fluorescence quenching by molecular oxygenKoichi Kikuchi, Chika Sato, Masanori Watabe, Hiroshi Ikeda, Yasutake Takahashi, and Tsutomu MiyashiCite this: J. Am. Chem. Soc. 1993, 115, 12, 5180–5184Publication Date (Print):June 1, 1993Publication History Published online1 May 2002Published inissue 1 June 1993https://pubs.acs.org/doi/10.1021/ja00065a033https://doi.org/10.1021/ja00065a033research-articleACS PublicationsRequest reuse...

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSolvent effects on photoinduced electron-transfer reactionsTaeko Niwa, Koichi Kikuchi, Noriyuki Matsusita, Michiko Hayashi, Tomoharu Katagiri, Yasutake Takahashi, and Tsutomu MiyashiCite this: J. Phys. Chem. 1993, 97, 46, 11960–11964Publication Date (Print):November 1, 1993Publication History Published online1 May 2002Published inissue 1 November 1993https://pubs.acs.org/doi/10.1021/j100148a019https://doi.org/10.1021/j100148a019research-articleACS...

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTQuenching mechanism in a highly exothermic region of the Rehm-Weller relationship for electron-transfer fluorescence quenchingKoichi Kikuchi, Taeko Niwa, Yasutake Takahashi, Hiroshi Ikeda, and Tsutomu MiyashiCite this: J. Phys. Chem. 1993, 97, 19, 5070–5073Publication Date (Print):May 1, 1993Publication History Published online1 May 2002Published inissue 1...

Reinforcement learning has recently been receiving increased attention as a method for robot with little or no priori knowledge and higher capability of reactive adaptive behaviors. However, there are two major problems in applying it to real tasks: how construct the state space, reduce time. This paper presents by which learns purposive behavior within less time incrementally segmenting sensor space based on experiences robot. The incremental segmentation is performed constructing local...

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHeavy-atom effects on the excited singlet-state electron-transfer reactionKoichi Kikuchi, Masato Hoshi, Taeko Niwa, Yasutake Takahashi, and Tsutomu MiyashiCite this: J. Phys. Chem. 1991, 95, 1, 38–42Publication Date (Print):January 1991Publication History Published online1 May 2002Published inissue 1 January 1991https://pubs.acs.org/doi/10.1021/j100154a011https://doi.org/10.1021/j100154a011research-articleACS PublicationsRequest reuse...

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEvidence for two different radical cation types derived from methylenecyclopropaneTsutomu Miyashi, Yasutake Takahashi, Toshio Mukai, Heinz D. Roth, and Marcia L. M. SchillingCite this: J. Am. Chem. Soc. 1985, 107, 4, 1079–1080Publication Date (Print):February 1, 1985Publication History Published online1 May 2002Published inissue 1 February 1985https://pubs.acs.org/doi/10.1021/ja00290a065https://doi.org/10.1021/ja00290a065research-articleACS...

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEvidence for a chair cyclohexane-1,4-radical cation intermediate in the single electron-transfer-induced Cope rearrangement of 2,5-diaryl-1,5-hexadienesTsutomu. Miyashi, Akinori. Konno, and Yasutake. TakahashiCite this: J. Am. Chem. Soc. 1988, 110, 11, 3676–3677Publication Date (Print):May 1, 1988Publication History Published online1 May 2002Published inissue 1...

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTrimethylenemethane cation radical: photosensitized (electron-transfer) generation and reactivityYasutake Takahashi, Tsutomu Miyashi, Toshio MukaiCite this: J. Am. Chem. Soc. 1983, 105, 21, 6511–6513Publication Date (Print):October 1, 1983Publication History Published online1 May 2002Published inissue 1 October 1983https://doi.org/10.1021/ja00359a037RIGHTS & PERMISSIONSArticle Views88Altmetric-Citations46LEARN ABOUT THESE METRICSArticle Views are...

Teleoperated robots are attracting attention as a solution to the pressing labor shortage. To reduce burden on operators of teleoperated and improve manpower efficiency, research is underway make these more autonomous. However, end-to-end imitation learning models that directly map camera images actions vulnerable changes in image background lighting conditions. robustness against changes, we modified model handle segmented where only arm object preserved. The task success rate for...

Advancements in robotics technology and information communication have significantly affected agriculture, especially systems that aid workers. Soil cultivation often requires prolonged bending, which results physical strain. A commercially available work wheelchair reduces back strain, but lacks power assistance relies on leg movements. In a previous study, we developed an electric with fabric pressure-distribution sensor the seat. This sensor, combined fuzzy controller, aids movement by...

According to Japan’s Ministry of Health, Labour and Welfare, work-related lower back pain is prevalent in industries such as commerce, finance, health, hygiene. Such primarily caused by performing tasks involving heavy lifting carrying various fields, including caregiving, transportation, agriculture. This study proposes a lumbar-powered exoskeleton assist movements. Passive exoskeletons use springs or rubber belts for assistive force, thus rendering them lightweight but unable provide...

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFree enthalpy dependence of free-radical yield photoinduced electron transfer in acetonitrileKoichi Kikuchi, Yasutake Takahashi, Masato Hoshi, Taeko Niwa, Tomoharu Katagiri, and Tsutomu MiyashiCite this: J. Phys. Chem. 1991, 95, 6, 2378–2381Publication Date (Print):March 1, 1991Publication History Published online1 May 2002Published inissue 1 March 1991https://doi.org/10.1021/j100159a048RIGHTS & PERMISSIONSArticle Views116Altmetric-Citations45LEARN...

Radio frequency identification (RFID) technology has already been explored for efficient self-localization of indoor mobile robots. A robot equipped with RFID readers detects passive tags installed on the floor in order to locate itself. The Monte-Carlo localization (MCL) method enables a an system reasonable accuracy, sufficient robustness and low computational cost. arrangements size antennas are important design parameters realizing accurate robust using low-cost system. likelihood model...

Q-learning, a most widely used reinforcement learning method, normally needs well-defined quantized state and action spaces to converge. This makes it difficult be applied real robot tasks because of poor performance learned behavior further problem space construction. paper proposes continuous valued Q-learning for applications, which calculates the contribution values estimating value in order make motion smooth effective. The proposed method obtained better desired than conventional...

2-(dideuteriomethylene)-1,1-bis(4-methoxyphenyl)cyclopropane (d(2)-1) undergoes degenerate rearrangement in both singlet- and triplet-sensitized electron-transfer photoreactions. Nanosecond time-resolved absorption spectroscopy on laser flash photolysis of the unlabeled 1 with 9,10-dicyanoanthracene, 1,2,4,5-tetracyanobenzene, or N-methylquinolinium tetrafluoroborate as an electron-accepting photosensitizer gives rise to two transients lambda(max) at 500 350 nm assigned dianisyl-substituted...

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNew Aspects on Fluorescence Quenching by Molecular Oxygen. 2. Inhibition of Long-Distance Electron Transfer in AcetonitrileChika Sato, Koichi Kikuchi, Kohji Okamura, Yasutake Takahashi, and Tsutomu MiyashiCite this: J. Phys. Chem. 1995, 99, 46, 16925–16931Publication Date (Print):November 1, 1995Publication History Published online1 May 2002Published inissue 1 November...

We have measured the decay of fluorescence from electron acceptors (A) dissolved in donor (D) solvent by femtosecond up-conversion spectroscopy with a time resolution 75 fs. The measurements been made for several (9-cyanoanthracene, CA; 9,10-dicyanoanthracene, DCA; and 1,2,9,10-tetracyanoanthracene, TCA) (N,N-dimethylaniline, DMA, aniline, ANL). times obtained are between 150 fs (CA–ANL) 280 (TCA–DMA). Observation acceptor concurrent rise exciplex state indicates that excited (A*) directly...

Under the 9,10-dicyanoanthracene-sensitized photoinduced electron-transfer conditions, (Z,Z)-, (E,E)-, (E,Z)-3,6-diaryl-2,6-octadiene and (d,l),(meso)-2,5-diaryl-3,4-dimethyl-1,5-hexadiene stereospecifically undergo Cope rearrangement to give a photostationary mixture. Remarkably, rearrangements of 4-methylphenyl derivatives are concurrent with formation trans- or endo,cis-1,4-bis(4-methylphenyl)-2,3-dimethylbicyclo[2.2.0]hexane in Observed stereospecificity bicyclo[2.2.0]hexane demonstrate...