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Optical tracking of picosecond coherent phonon pulse focusing inside a sub-micron object

Light(Science & Applications) 2016年第1期5卷 653-659页

作者： Thomas Dehoux kenichi ishikawa Paul H Otsuka Motonobu Tomoda Osamu Matsuda Masazumi Fujiwara Shigeki Takeuchi Istvan A Veres Vitalyi E Gusev Oliver B Wright Institut Lumière Matière UMR5306UniversitéLyon 1-CNRSUniversitéde Lyon69622 VilleurbanneFrance Division of Applied Physics Faculty of EngineeringHokkaido UniversitySapporo 060-8628Japan Research Institute for Electronic Science Hokkaido UniversitySapporo 001-0020Japan School of Science and Technology Kwansei Gakuin UniversitySandaHyogo 669-1337Japan Department of Electronic Science and Engineering Kyoto UniversityKyoto 615-8510Japan Research Centre for Non-Destructive Testing GmbH Altenberger Strasse 69A-4040 LinzAustria Laboratoire d'Acoustique de l'Université du MaineLe Mans 72085France

By means of an ultrafast optical technique,we track focused gigahertz coherent phonon pulses in objects down to sub-micron in *** light pulses illuminating the surface of a single metal-coated silica fibre generate longitudinal-phonon wave *** of visible probe light pulses from the fibre surface allows the vibrational modes of the fibre to be detected,and Brillouin optical scattering of partially transmitted light pulses allows the acoustic wavefronts inside the transparent fibre to be continuously *** thereby probe acoustic focusing in the time domain resulting from generation at the curved fibre *** analytical model,supported by three-dimensional simulations,suggests that we have followed the focusing of the acoustic beam down to a~150-nm diameter waist inside the *** work significantly narrows the lateral resolution for focusing of picosecond acoustic pulses,normally limited by the diffraction limit of focused optical pulses to~1μm,and thereby opens up a new range of possibilities including nanoscale acoustic microscopy and nanoscale computed tomography.

关键词： acoustic–optic fibre optical scattering picosecond ultrasonics

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Attosecond Optical and Ramsey-Type Interferometry by Postgeneration Splitting of Harmonic Pulse

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Ultrafast Science 2022年第3期2卷 9-17页

作者： Takuya Matsubara Yasuo Nabekawa kenichi L.ishikawa Kaoru Yamanouchi Katsumi Midorikawa Attosecond Science Research Team RIKEN Center for Advanced Photonics2-1 HirosawaWako-shiSaitama 351-0198Japan Department of Chemistry School of ScienceThe University of Tokyo7-3-1 HongoBunkyo-kuTokyo 113-0033Japan Department of Nuclear Engineering and Management Graduate School of EngineeringThe University of Tokyo7-3-1 HongoBunkyo-kuTokyo 113-8656Japan Photon Science Center Graduate School of EngineeringThe University of Tokyo7-3-1 HongoBunkyo-kuTokyo 113-8656Japan Research Institute for Photon Science and Laser Technology The University of Tokyo7-3-1 HongoBunkyo-kuTokyo 113-0033Japan

Attosecondattosecond science;extreme ultraviolet;high-order harmonic generation;Ramsey-type spectroscopy Optical and Ramsey-Type Interferometry by Postgeneration Splitting of Harmonic PulseTime domain Ramsey-type interferometry is useful for investigating spectroscopic information of quantum states in atoms and *** energy range of the quantum states to be observed with this scheme has now reached more than 20 eV by resolving the interference fringes with a period of a few hundred *** attosecond Ramsey-type interferometry requires the irradiation of a coherent pair of extreme ultraviolet(XUV)light pulses,while all the methods used to deliver the coherent XUV pulse pair until now have relied on the division of the source of an XUV pulse in two before the *** this paper,we report on a novel technique to perform attosecond Ramsey-type interferometry by splitting an XUV high-order harmonic(HH)pulse of a sub-20 fs laser pulse after its *** virtue of the postgeneration splitting of the HH pulse,we demonstrated that the optical interference emerging at the complete temporal overlap of the HH pulse pair seamlessly continued to the Ramsey-type electronic interference in a helium *** technique is applicable for studying the femtosecond dephasing dynamics of electronic wavepackets and exploring the ultrafast evolution of a cationic system entangled with an ionized electron with sub-20 fs resolution.

关键词： attosecond science extreme ultraviolet high-order harmonic generation Ramsey-type spectroscopy Optical and Ramsey-Type Interferometry by Postgeneration Splitting of Harmonic Pulse

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Double ionization of He at SPring-8 EUV-FEL pulses

Double ionization of He at SPring-8 EUV-FEL pulses

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第十六届全国原子与分子物理学术会议

作者：马日丁大军金明星 kenichi L.ishikawa H.Fukuzawa K.Motomura A.Yamada K.Ueda K.Nagaya S.Yase Y.Mizoguchi M.Yao A.Rouzee A.Hundermark M.Vrakking P.Johnsson M.Nagasono T.Togashi K.Tono Y.Senba H.Ohashi M.Yabashi and T.ishikawa Institute of Atomic and Molecular Physics Jilin University IMRAM Tohoku University RIKEN XFELSayoHyogo 679-5148Japan FOM Institute AMOLF 1098 XG AmsterdamNetherlands Department of Physics Lund University

We study the photoelectron angular distribution(PAD) from the two-photon ionization(TPI) of He by femtosecond EUV *** measurement at the SPring-8 EUV-FEL and the calculation with the time-dependent Schr(o|¨)dinger eq...

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Over-the-scope-clipping system for anastomotic leak after colorectal surgery:Report of two cases

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World Journal of Gastroenterology 2014年第24期20卷 7984-7987页

作者： Hirotoshi Kobayashi Akifumi Kikuchi Satoshi Okazaki Megumi Ishiguro Toshiaki ishikawa Satoru Iida Hiroyuki Uetake kenichi Sugihara Center for Minimally Invasive Surgery Tokyo Medical and Dental UniversityTokyo 113-8519Japan Department of Surgical Oncology Graduate SchoolTokyo Medical and Dental UniversityTokyo 113-8519Japan Department of Translational Oncology Graduate SchoolTokyo Medical and Dental UniversityTokyo 113-8519Japan

An anastomotic leak is one of the major complications following colorectal *** treatments for anastomotic leak are total parenteral nutrition or temporary *** over-the-scope-clipping(OTSC)system was originally developed to treat intestinal perforation or to close the tissue after natural orifice transluminal endoscopic *** cases of successful management of an anastomotic leak after colorectal surgery using the OTSC system are *** patient avoided a temporary *** the other,hospitalization was shortened by the use of the OTSC *** OTSC system can be a potential option in the management of anastomotic leaks after colorectal surgery.

关键词： Over-the-scope-clipping Colorectal cancer Anastomotic leak Colorectal surgery Double stapling technique

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Electron Microscopy Analysis of Deformation Induced ε Martensite Transformation in an Fe-Mn-Si-Cr-Ni Alloy

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Journal of Materials Science & Technology 1994年第4期10卷 263-268页

作者： Fuxing YIN Jianxin ZHANG Ruixiang WANG and Nanju GU (Hebei Institute of Technology, Tianjin, 300132, China)(To whom correspondence should be addressed)kenichi Shimizu (Kanazawa Institute of Technology, ishikawa, Japan) Hebei Inst of Technology Tianjin China

The configurations of stacking faults and morphologies of strain induced ε martensite plates in an FeMnSiCrNi alloy were investigated through electron microscopy analysis. The Shockley partial dislocation structures. sensitive to external stress. determine the configurations of stacking faults in γphase Partial dislocations at the front sides of stacking faults are usetul for the nucleation of εmartensite plates. The growth of ε martensite plates is accompanied with the disappearance of local pre-existing stacking faults, The ε martensite vanants behave in three morphologies of respective stopping. continuous penetrating and intersections with the formation of secondary ε martensite plates

关键词： Mn Electron Microscopy Analysis of Deformation Induced Martensite Transformation in an Fe-Mn-Si-Cr-Ni Alloy Fe Si Cr Ni

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Clinical Significance of Platelet-Derived Growth Factor-C Expression in Colorectal Cancer

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Journal of Cancer Therapy 2014年第1期5卷 11-20页

作者： Shinichi Yamauchi Satoru Iida Megumi Ishiguro Toshiaki ishikawa Hiroyuki Uetake kenichi Sugihara Department of Surgical Oncology Graduate School Tokyo Medical and Dental University Tokyo Japan Department of Translational Oncology Graduate School Tokyo Medical and Dental University Tokyo Japan

Platelet-derived growth factors (PDGFs) are known to be associated with tumor growth and angiogenesis through their activation of the receptor tyrosine kinases, PDGF receptors alpha and beta. Several studies revealed the participation of the PDGF family in colorectal cancer (CRC). However, the role of platelet derived growth factor-C (PDGFC) in CRC is less well studied. This study aimed to determine the correlation between PDGFC expression and the prognosis of patients with CRCs. Tumor samples were obtained from patients with CRC who underwent surgical resection between 2002 and 2006. The mRNA expression of PDGFC was investigated by quantitative reverse transcription-polymerase chain reaction in 85 patients with stage I-IV CRC. PDGFC protein expression was analyzed by immunohistochemistry, and the relationship between PDGFC protein expression and clinicopathologic features was investigated in 245 patients with stage I-III CRC. PDGFC mRNA expression in cancer tissues was significantly higher in patients with distant metastases than in those without metastases (P = 0.016). PDGFC protein overexpression was associated with significantly worse overall and relapse-free survival (P P < 0.0001, respectively). Moreover, PDGFC protein overexpression was an independent risk factor for CRC recurrence (relative risk = 3.395, 95% confidence interval = 1.895 - 6.081, P < 0.001). In the present study, PDGFC overexpression appeared to be predictive of recurrence and poor prognosis in patients with CRC.

关键词： Platelet-Derived Growth Factor-C Colorectal Cancer Prognosis mRNA Expression Immunohistochemistry

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Bovine sperm selection procedure prior to cryopreservation for improvement of post-thawed semen quality and fertility

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Journal of Animal Science and Biotechnology 2020年第1期11卷 44-57页

作者： MariaPortia B.Nagata Junki Egashira Naoto Katafuchi Kenji Endo Kazuko Ogata kenichi Yamanaka Tadayuki Yamanouchi Hideo Matsuda Yutaka Hashiyada kenichi Yamashita Advanced Manufacturing Research Institute National Institute of Advanced Industrial Science and Technology(AIST)807-1 Shuku-machiTosuSaga 841-0052Japan Saga Prefectural Livestock Experiment Station 23242-2 Yamauchi-machiMiyanoTakeoSaga 849-2305Japan Morinaga Dairy Service Co.Ltd. 1-159 ToyoharaotsuNasu-gun Nasu-machiTochigi 329-3224Japan National Livestock Breeding Center(NLBC) 1 OdakuraharaOdakuraNishigo-muraNishishirakawa-gunFukushima 961-8511Japan Institute of Livestock and Grassland Science National Agriculture and Food Research Organization(NARO)Ikenodai 2TsukubaIbaraki 305-0901Japan Faculty of Agriculture Saga University1 Honjo-machiSaga 840-8502Japan.7Ishikawa Prefectural University1-308 SuematsuNonoichi-shiIshikawa 921-8836Japan.

Background:The application of cryopreservation and artificial insemination technology have contributed to the advancement of animal ***,a substantial proportion of spermatozoa undergoes alterations and loses their fertility during cryopreservation,rendering the frozen-thawed semen impractical for routine *** is known to reduce sperm lifespan and *** in cryosurvival of spermatozoa from different sires and even with the individual sire is common in artificial insemination(AI)*** goal is to improve post-thawed semen quality by optimization of cryopreservation technique through sperm selection prior to cryopreservation ***:Our strategy of sperm selection based on rheotaxis and thermotaxis(SSRT)on macrosale in a rotating fluid flow demonstrated the ability to maintain the original pre-freezing structural integrity,viability and biological function related to fertilization *** strategy has a positive effect on the cryosurvival and fertilizing abilities of spermatozoa as supported by the improvement on pregnancy rate of Japanese Black heifers and Holstein repeat *** technique protected further sublethal damage to bovine spermatozoa(higher%cryosurvival than the control)and resulted in the improvement of DNA *** selected spermatozoa demonstrated slower and controlled capacitation than unprocessed control which is thought to be related to sperm longevity and consequently to appropriate timing during in vivo ***:These results provide solid evidence that improvement of post-thawed semen quality by SSRT method is beneficial in terms of cryosurvival,longevity of post-thawed sperm,and optimization of in vivo fertilization,embryo development and calving as supported by the favorable results of field fertility study.

关键词： Cryopreservation Fertility Livestock Rheotaxis Spermatozoa Thermotaxis

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One Case of Suspected Angiostenosis Revealed by MRA Following Carotid Endarterectomy Due to a Rare Cause

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Open Journal of Modern Neurosurgery 2018年第3期8卷 276-281页

作者： Yuji Endo Naoki Sato Hidekazu Takahashi Mamoru Ota Toshihito ishikawa Katsuhiro Endo kenichi Ebihara Department of Neurosurgery Masu Memorial Hospital Fukushima Japan Department of Neurosurgery Ageo Central General Hospital Saitama Japan

We herein report on a case in which magnetic resonance angiography (MRA) following carotid endarterectomy revealed the appearance of angiostenosis due to an artifact of metallic powder, which was thought to have come from an old surgical instrument. The patient was a 77-year-old male. Carotid endarterectomy (CEA) was performed for stenosis in the internal carotid artery of his left neck (82%). Upon observing a decline in renal function following CEA surgery, a postoperative cervical MRA revealed the appearance of high-grade stenosis at the common carotid artery on which surgery was performed. No stenosis was revealed upon carotid ultrasonography and angiography. In the original MRA image, an orbicular low intensity area was observed in concordance with the narrow segment. 3D computed tomography (3D-CT) revealed a metallic finding, suggesting it was an artifact caused by metal powder. Close inspection of the metal surgical instruments used during surgery revealed slight damage to a suture snare which had been used for 30 years. Going forward, it is necessary to pay attention to old surgical instruments, introduce a system by which the number of years and the frequency of use of each surgical instrument can be learned, and replace them with new equipment as necessary.

关键词： Carotid Endarterectomy Operation Metal Artifact Surgical Instruments

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Integrated in-process chatter monitoring and automatic suppression with adaptive pitch control in parallel turning

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Advances in Manufacturing 2018年第3期6卷 291-300页

作者： Shuntaro Yamato Yuki Yamada kenichi Nakanishi Norikazu Suzuki Hayato Yoshioka Yasuhiro Kakinuma Department of System Design Engineering Keio University3-14-1 Hiyoshi Kohoku-ku Yokohama 223-8522 Japan Nakamura-Tome Precision Industry Co. Ltd. 15 NetsunoHakusan Ishikawa 920-2195 Japan Department of Mechanical Science and Engineering Nagoya University Furo-cho Chikusa-ku Nagoya 464-8603 Japan Precision and Intelligent Laboratory Tokyo Institute of Technology 4259-G2-19 Nagatsuta Midori-kuYokohama 226-8503 Japan

Simultaneous processes such as parallel turningor milling offer great opportunities for more efficientmanufacturing because of their higher material removalrates. To maximize their advantages, chatter suppressiontechnologies for simultaneous processes must be devel-oped. In this study, we constructed an automatic chattersuppression system with optimal pitch control for shared-surface parallel turning with rigid tools and a flexibleworkpiece, integrating in-process chatter monitoring basedon the cutting force estimation. The pitch angle betweentwo tools is tuned adaptively in a position control system inaccordance with the chatter frequency at a certain spindlespeed, in a similar manner as the design methodology forvariable-pitch cutters. The cutting force is estimatedwithout using an additional external sensor by employing amulti-encoder-based disturbance observer. In addition, thechatter frequency is measured during the process by per-forming a low-computational-load spectrum analysis at acertain frequency range, which makes it possible to cal-culate the power spectrum density in the control system ofthe machine tool. Thus, the constructed system for automatic chatter suppression does not require any addi-tional equipment.

关键词： Chatter Multitasking machine tool Parall elturning Adaptive control Sensorless Disturbance observer

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Recent traction methods for endoscopic submucosal dissection

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World Journal of Gastroenterology 2016年第26期22卷 5917-5926页

作者： Kunihiro Tsuji Naohiro Yoshida Hiroyoshi Nakanishi kenichi Takemura Shinya Yamada Hisashi Doyama Department of Gastroenterology Ishikawa Prefectural Central Hospital

Endoscopic mucosal resection(EMR) is problematic with regard to en bloc and curable resection *** in endoscopic techniques have enabled novel endoscopic approaches such as endoscopic submucosal dissection(ESD), which has overcome some EMR problems, and has become the standard treatment for gastrointestinal tumors. However, ESD is technically difficult. Procedure time is longer and complications such as intraoperative perforation and bleeding occur more frequently than in EMR. Recently various traction methods have been introduced to facilitate ESD procedures, such as clip with line, external forceps, clip and snare, internal traction, double scope, and magnetic anchor. Each method must be used appropriately according to the anatomical characteristics. In this review we discuss recently proposed traction methods for ESD based on the characteristics of various anatomical sites.

关键词： Endoscopic submucosal dissection Traction Pharyngeal cancer Esophageal cancer Gastric cancer Colorectal cancer

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