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Corticospinal excitability during motor imagery is diminished by continuous repetition-induced fatigue

Neural Regeneration Research 2021年第6期16卷 1031-1036页

作者： Akira Nakashima Takefumi Moriuchi Daiki Matsuda Takashi Hasegawa Jirou Nakamura Kimika Anan Katsuya Satoh Tomotaka Suzuki Toshio Higashi kenichi sugawara Department of Rehabilitation Juzenkai HospitalNagasakiJapan Graduate School of Biomedical Sciences Nagasaki UniversityNagasakiJapan School of Rehabilitation Kanagawa University of Human ServicesYokosukaJapan

Application of continuous repetition of motor imagery can improve the performance of exercise ***,there is a lack of more detailed neurophysiological evidence to support the formulation of clear standards for interventions using motor ***,identification of motor imagery intervention time is necessary because it exhibits possible central ***,the purpose of this study was to elucidate the development of fatigue during continuous repetition of motor imagery through objective and subjective *** study involved two *** experiment 1,14 healthy young volunteers were required to imagine grasping and lifting a 1.5-L plastic bottle using the whole *** participant performed the motor imagery task 100 times under each condition with 48 hours interval between two conditions:500 mL or 1500 mL of water in the bottle during the demonstration *** fatigue and a decrease in pinch power appeared under the 1500-mL *** were changes in concentration ability or corticospinal excitability,as assessed by motor evoked potentials,between each set with continuous repetition of motor imagery also under the 1500-mL ***,in experiment 2,12 healthy volunteers were required to perform the motor imagery task 200 times under the 1500-mL *** concentration ability and corticospinal excitability *** is the first study to show that continuous repetition of motor imagery can decrease corticospinal excitability in addition to producing mental *** study was approved by the Institutional Ethics Committee at the Nagasaki University Graduate School of Biomedical and Health Sciences(approval No.18121302)on January 30,2019.

关键词： central nervous system concentration continuous repetition of motor imagery corticospinal excitability mental fatigue motor evoked potential motor imagery muscle fatigue neurophysiology transcranial magnetic stimulation

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Dynamic performance and reflection sensitivity of quantum dot distributed feedback lasers with large optical mismatch

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Photonics Research 2021年第8期9卷 1550-1558页

作者： BOZHANG DONG JIANAN DUAN HEMING HUANG JUSTIN CNORMAN kenichi NISHI KEIZO TAKEMASA MITSURU sugawara JOHN EBOWERS FRéDéRIC GRILLOT LTCI Telecom ParisInstitut Polytechnique de Paris19 Place Marguerite Perey91120 PalaiseauFrance Institute for Energy Efficiency University of CaliforniaSanta BarbaraCalifornia 93106USA Materials Department University of CaliforniaSanta BarbaraCalifornia 93106USA QD Laser Inc.KawasakiKanagawa 210-0855Japan Department of Electrical and Computer Engineering University of CaliforniaSanta BarbaraCalifornia 93106USA Center for High Technology Materials University of New-MexicoAlbuquerqueNew Mexico 87106USA Current address:State Key Laboratory on Tunable Laser Technology School of Electronic and Information EngineeringHarbin Institute of TechnologyShenzhen 518055China

This work reports on a high-efficiency In As/Ga As distributed feedback quantum dot *** large optical wavelength detuning at room temperature between the lasing peak and the gain peak causes the static,dynamic,and nonlinear intrinsic properties to all improve with temperature,including the lasing efficiency,the modulation dynamics,the linewidth enhancement factor,and consequently the reflection *** reported show an optimum operating temperature at 75°C,highlighting the potential of the large optical mismatch assisted single-frequency laser for the development of uncooled and isolator-free high-speed photonic integrated circuits.

关键词： mismatch optical tuning

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Techniques for Avoiding Saccular Extended Obstruction at the Anastomotic Site of Functional End-to-End Anastomosis

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Surgical Science 2017年第7期8卷 305-311页

作者： Koichi Yoshida kenichi Ietsugu Jyunpei Okamoto Saki Hayashi Yoshihide Asaumi Naohiro Ota Hiroyuki sugawara Satoshi Tabata Masahiro Kaneki Mitsuaki Sakatoku Kaoru Kiyohara Department of Surgery Tonami General Hospital Toyama Japan

Saccular extended obstruction is generated when the anastomotic site of functional end-to-end anastomosis is extended saccularly and blocked by intestinal contents. This is a specific complication of functional end-to-end anastomosis. Saccular extended obstruction of the anastomotic site of func-tional end-to-end anastomosis causes postoperative intestinal obstruction. Saccular extended obstruction places a heavy burden on patients because surgery is necessary for treatment of intestinal obstruction due to saccular extended obstruction. However, saccular extended obstruction is not a commonly recognized complication. The greatest factor contributing to the development of saccular extended obstruction is an acute angle between the portions of the intestinal tract oral and aboral to the anastomotic site. When this angle approaches obtuse angle, preferably close to a straight line, stagnation of the intestinal contents does not occur at the anastomotic site of functional end-to-end anastomosis and saccular extended obstruction is avoided. For making the angle of anastomotic intestinal tracts obtuse or straight, it may be effective that the entry hole of stapling suture instrument creating the anastomotic stoma is closed perpendicular to the intestinal axis.

关键词： Functional End-to-End Anastomosis Stapling Anastomosis Anastomosis Postoperative Complication Intestinal Obstruction

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Quantum dot mode-locked frequency comb with ultra-stable 25.5 GHz spacing between 20℃ and 120℃

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Photonics Research 2020年第12期8卷 1937-1942页

作者： SHUJIE PAN JIANOU HUANG ZICHUAN ZHOU ZHIXIN LIU LALITHA PONNAMPALAMZIZHUO LIU MINGCHU TANG MU-CHIEH LO ZIZHENG CAO kenichi NISHI KEIZO TAKEMASA MITSURU sugawara RICHARD PENTY IAN WHITE ALWYN SEEDS HUIYUN LIU SIMING CHEN Department of Electronic and Electrical Engineering University College LondonTorrington PlaceLondonWC1E 7JEUnited Kingdom Institute of Photonic Integration Eindhoven University of TechnologyEindhoven 5600 MBThe Netherlands QD Laser Inc.Kawasaki 210-0855Japan Centre for Photonics Systems Department of EngineeringUniversity of CambridgeCambridge CB3 OFAUnited Kingdom

Semiconductor mode-locked lasers(MLLs)are promising frequency comb sources for dense wavelength-divisionmultiplexing(DWDM)data *** data communication requires a frequency-stable comb source in a temperature-varying environment and a minimum tone spacing of 25 GHz to support high-speed DWDM *** the best of our knowledge,however,to date,there have been no demonstrations of comb sources that simultaneously offer a high repetition rate and stable mode spacing over an ultrawide temperature ***,we report a frequency comb source based on a quantum dot(QD)MLL that generates a frequency comb with stable mode spacing over an ultrabroad temperature range of 20–120℃.The two-section passively mode-locked In As QD MLL comb source produces an ultra-stable fundamental repetition rate of 25.5 GHz(corresponding to a 25.5 GHz spacing between adjacent tones in the frequency domain)with a variation of 0.07 GHz in the tone spacing over the tested temperature *** keeping the saturable absorber reversely biased at-2 V,stable mode-locking over the whole temperature range can be achieved by tuning the current of the gain section only,providing easy control of the *** an elevated temperature of 100℃,the device shows a 6 d B comb bandwidth of 4.81 nm and 31 tones with>36 d B optical signal-to-noise *** corresponding relative intensity noise,averaged between 0.5 GHz and 10 GHz,is-146 d Bc∕*** results show the viability of the In As QD MLLs as ultra-stable,uncooled frequency comb sources for low-cost,large-bandwidth,and low-energy-consumption optical data communications.

关键词： DWDM mode noise

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