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Nonlocalized clustering and evolution of cluster structure in nuclei

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Frontiers of physics 2020年第1期15卷 71-134页

作者： Bo Zhou Yasuro Funaki hisashi horiuchi Akihiro Tohsaki Institute for the Advancement of Higher Education Hokkaido UniversitySapporo 060-0817Japan Department of Physics Hokkaido UniversitySapporo 060-0810Japan College of Science and Engineering Kanto Gakuin UniversityYokohama 236-8501Japan Research Center for Nuclear Physics(RCNP) Osaka UniversityOsaka 567-0047Japan

We explain various facets of the THSR(Tohsaki-horiuchi Schuck-Ropke)wave *** first discuss the THSR,wave function as a wave function of cluster-gas state,since the THSR,wave function was originally introduced to elucidate the 3a-condensate-like character of the Hoyle state(O2^+ state)of *** briefly review the cluster-model studies of the Hoyle state in 1970’s in order to explain how there emerged the idea to assign the a condensate character to the Hoyle *** then explain that the THSR wave function can describe very well also non-gaslike ordinary cluster states with spatial localization of *** fact means that the dynamical motion of clusters is of nonlocalized nature just as in gas-like states of clusters and the localization of clusters is due to the inter-cluster Pauli principle which is against the close approach of two *** nonlocalized cluster dynamics is formulated by the container model of cluster *** container model describes gas-like state and non-gaslike states as the solutions of the Hill Wheeler equation with respect to the size parameter of THSR wave function which is just the size parameter of the *** we notice that fact that the THSR wave function with the smallest value of size parameter is equivalent to the shell-model wave function,we see that the container model describes the evolution of cluster structure from the ground state with shell-model structure up to the gas-like cluster state via ordinary non-gaslike cluster *** the description of various cluster structure,more generation of THSR wave function have been introduced and we review some typical examples with their actual applications.

关键词： Hoyle state alpha condensation THSR wave function,nonlocalized clustering container model evolution of cluster structure

Finite particle number description of neutron matter using the unitary correlation operator and high-momentum pair methods

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Chinese Physics C 2020年第12期44卷 133-145页

作者： Niu Wan Takayuki Myo Chang Xu Hiroshi Toki hisashi horiuchi Mengjiao Lyu School of Physics Nanjing UniversityNanjing 210093China General Education Faculty of EngineeringOsaka Institute of TechnologyOsakaOsaka 535-8585Japan Research Center for Nuclear Physics(RCNP) Osaka UniversityIbarakiOsaka 567-0047Japan College of Science Nanjing University of Aeronautics and AstronauticsNanjing 210093China

Using bare Argonne V4'(AV4'),V6'(AV6'),and V8'(AV8')nucleon–nucleon(NN)interactions,the nuclear equations of state(EOSs)for neutron matter are calculated with the unitary correlation operator and high-momentum pair *** matter is described using a finite particle number approach with magic number N=66 under a periodic boundary *** central short-range correlation originating from the short-range repulsion in the NN interaction is treated by the unitary correlation operator method(UCOM),and the tensor correlation and spin-orbit effects are described by the two-particle two-hole(2p2h)excitations of nucleon pairs,where the two nucleons with a large relative momentum are regarded as a high-momentum(HM)*** increasing 2p2h configurations,the total energy per particle of the neutron matter is well-converged under this UCOM+HM *** the results calculated with AV4',AV6',and AV8'NN interactions,we demonstrate the effects of the short-range correlation,tensor correlation,and spin-orbit coupling on the density dependence of the total energy per particle of neutron ***,the contribution of each Hamiltonian component to the total energy per particle is *** EOSs of neutron matter calculated within the present UCOM+HM framework agree with the calculations of six microscopic many-body theories,especially the auxiliary field-diffusion Monte Carlo calculations.

关键词： high-momentum pair nucleon-nucleon interaction equation of state neutron matter

Improving quality measures in colonoscopy and its therapeutic intervention

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World Journal of Gastroenterology 2014年第36期20卷 13027-13034页

作者： Akira horiuchi Naoki Tanaka Digestive Disease Center Showa Inan General Hospital Komagane 399-4117 Japan Laboratory of Metabolism National Cancer Institute National Institutes of Health Bethesda MD 20892 United States

Colonoscopy with polypectomy has been shown to reduce the risk of colon cancer. The critical element in the quality of colonoscopy in terms of polyp detection and removal continues to be the performance of the endoscopist, independent of patient-related factors. Improved results in terms of polyp detection and complete removal have implications regarding the development of screening and surveillance intervals and the reduction of interval cancers after negative colonoscopy. Advances in colonoscopy techniques such as high-definition colonoscopy, hood-assisted colonoscopy and dye-based chromoendoscopy have improved the detection of small and flat-type colorectal polyps. Virtual chromoendoscopy has not proven to improve polyp detection but may be useful to predict polyp pathology. The majority of polyps can be removed endoscopically. Available polypectomy techniques include cold forceps polypectomy, cold snare polypectomy, conventional polypectomy, endoscopic mucosal resection and endoscopic submucosal dissection. The preferred choice depends on the polyp size and characteristics. Other useful techniques include colonoscopic hemostasis for acute colonic diverticular bleeding, endoscopic decompression using colonoscopic stenting, and transanal tube placement for colorectal obstruction. Here we review the current knowledge concerning the improvement of quality measures in colonoscopy and colonoscopy-related therapeutic interventions.

关键词： Colonoscopy Polypectomy Hemostasis Endoscopic decompression Colorectal polyp Colonic diverticular bleeding Colorectal obstruction Gastrointestinal endoscopy

Hydraulic model tests for evaluating sediment control function with a grid-type Sabo dam in mountainous torrents

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International Journal of Sediment Research 2013年第4期28卷 511-522页

作者： Takahiro ITOH Shigeo horiuchi Takahisa MIZUYAMA Kazuhiko KAITSUKA NIPPON KOEI Co. Ltd Pasco Corporation Graduate School of Agriculture Kyoto University NIPPON KOEI Co. Ltd.

There are two kinds of Sabo dams in order to control sediment transport by debris flow and flash floods in mountainous area,which arc closed and open-type’s *** Japan,open-type’s Sabo dams are constructed taking into account the continuity of sediment routing from upstream to downstream reach in a basin.A plan to construct a 20 m high grid-type Sabo dam which can capture a sediment volume of 400,000 nr is proposed in the Amahata river basin in *** model tests are conducted to decide on the section for a dam(Section A,B) and the grid size such as clearance of vertical/horizontal bars for evaluating the *** runs of flume tests are conducted and the sediment control function of the Sabo dam is discussed using several experimental data such as dimensionlcss sediment runoff rate from Sabo dam,temporal changes of bed profile and mean diameter and so *** was found that sediment deposition in sediment storage area of Sabo dam was affected by curved channel,and that next the grid size of steel bars and thirdly the section of a dam was able to capture sediment in storage area of Sabo *** was controlled well in the section B and in the grid size of l.0×d95,and the problems related to sediment runoff after sediment capturing in Sabo dam are pointed out.

关键词： Hydraulic model tests Debris flow Grid-type Sabo dam Sediment storage

Formation of Non-Maxwellian Distribution and Its Role in Collisionless Driven Reconnection

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Communications in Computational Physics 2008年第8期4卷 496-505页

作者： R.horiuchi H.Ohtani National Institute for Fusion Science Toki 509-52Japan The Graduate University for Advanced Studies Toki 509-52Japan

The dynamical evolution of collisionless driven reconnection is investigated by using an electromagnetic particle simulation code in a microscopic open *** in-plane electrostatic field is excited in the central region of current sheet under the influence of an external driving *** a result of the amplification of unmagnetized meandering motion by the electrostatic field particle distribution function is modified from the shifted Maxwellian to an anisotropic one in the current *** ion hole appears at the center of current sheet in the phase space,where distribution becomes two-peaked and no ions exist in low velocity region between two *** strongmodification of distribution function leads to the generation of off-diagonal components of pressure tensor term,which is one of major causes to violate frozen-in constraint and trigger collisionless reconnection.

关键词： Collisionless reconnection particle simulation open system multi-scale physics

Sigmoid colon endometriosis treated with laparoscopy-assisted sigmoidectomy:Significance of preoperative diagnosis

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World Journal of Gastroenterology 2007年第40期13卷 5400-5402页

作者： Motohira Yoshida Yuji Watanabe Atsushi horiuchi Yuji Yamamoto Hiroki Sugishita Kanji Kawachi Department of Organ Regenerative Surgery Ehime University Graduate School of MedicineShitsukawaToonEhime 791-0295Japan

We present a female patient with sigmoid colon endometriosis who was diagnosed correctly preoperatively and underwent minimally invasive surgery. She was admitted to our hospital with rectal bleeding and constipation. We performed several workups. Colonoscopy and endoscopic ultrasonography showed sigmoid colon stenosis caused by submucosal tumor, and magnetic resonance imaging revealed a sigmoid colon tumor displaying signal hy- pointensity on both T1- and T2-weighted imaging. However, colonoscopic ultrasonography-assisted needle aspiration biopsy could not specify tumor characteristics. From these examinations, the lesion was diagnosed as sigmoid colon endometriosis and laparoscopy-assisted sigmoidectomy was performed. Pathological diagnosis from the resected specimen was identical to preoperative diagnosis, i.e., colonic endometriosis. Since differential diagnosis of intestinal endometriosis seems difficult, a cautious preoperative diagnosis is required to select treatments including minimally invasive surgery.

关键词： Intestinal endometriosis Preoperative diagnosis Laparoscopy-assisted surgery

The role of dietary nitrate supplementation in neurovascular function

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Neural Regeneration Research 2021年第7期16卷 1419-1420页

作者： Masahiro horiuchi Gabriella M.K.Rossetti Samuel J.Oliver Division of Human Environmental Science Mount Fuji Research InstituteYamanashiJapan School of Sport Health and Exercise SciencesCollege of Human SciencesBangor UniversityBangorUK

A healthy diet combined with increased physical activity levels may protect against cerebrovascular dysfunction and cognitive impairments(Gorelick et al., 2011).Compared with the number of studies on the effects of physical activity, studies on how diet affects cerebral blood flow(CBF) regulation and cognitive function are relatively ***, we focus on the potential role of dietary nitrate supplementation in CBF regulation and cognitive function under normoxic and hypoxic conditions.

关键词： al. nitrate conditions.

Safety and effectiveness of propofol sedation during and after outpatient colonoscopy

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World Journal of Gastroenterology 2012年第26期18卷 3420-3425页

作者： Akira horiuchi Yoshiko Nakayama Masashi Kajiyama Naoyuki Kato Tetsuya Kamijima Yasuyuki Ichise Naoki Tanaka Digestive Disease Center Showa Inan General HospitalKomagane 399-4117Japan Department of Pediatrics Shinshu University School of MedicineMatsumoto 390-8621Japan Department of Metabolic Regulation Shinshu University Graduate School of MedicineMatsumoto 390-8621Japan

AIM:To study the safety and effectiveness of propofol sedation for outpatient ***:Propofol was given by bolus injection with an age-adjusted standard protocol consisting of 60 mg for patients < 70 years old,40 mg for patients age 70-89 years,and 20 mg for those ≥ 90 years,and additional injections of 20 mg propofol were given up to a maximum of 200 *** principal parameters were the occurrence of adverse events within 24 h after colonoscopy and overall satisfaction for this *** parameters included successful procedure,respiratory depression,and other ***:Consecutive patients were entered prospectively and all 2101 entered successfully completed outpatient *** mean dose of propofol used was 96.4 mg(range 40-200 mg).Younger patients required higher doses of propofol than older patients(20-40 years vs ≥ 61 years:115.3 ± 32 mg vs 89.7 ± 21 mg,P < 0.001).Transient supplemental oxygen supply was needed by five patients(0.2%);no other complications *** questionnaires were completed by 1820(87%) of 2101 patients and most rated their overall satisfaction as excellent(80%) or good(17%).The majority(65%) of patients drove home or to their office after their ***(99%) were willing to repeat the same *** incidents occurred within 24 h after ***:Propofol sedation using a dose < 200 mg proved both safe and practical for outpatient colonoscopy.

关键词： Colonoscopy Propofol Colorectal cancer

Simulation of Plasma Flow Injectionwith Multi-Hierarchy Model Aiming Magnetic Reconnection Studies

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Communications in Computational Physics 2012年第3期11卷 1006-1021页

作者： S.Usami H.Ohtani R.horiuchi M.Den Department of Helical Plasma Research National Institute for Fusion ScienceToki509-5292Japan The Graduate University for Advanced Studies(Soken-dai) Toki509-5292Japan National Institute of Information and Communications Technology Koganei 184-8795Japan

A multi-hierarchy simulation model aiming magnetic reconnection studies is developed and improved in which macroscopic and microscopic physics are computed consistently and *** physics is solved by magnetohydrodynamics(MHD)algorithm,while microscopic dynamics is expressed by particle-in-cell(PIC)*** multi-hierarchy model relies on the domain decomposition method,and macro-and micro-hierarchies are interlocked smoothly by hand-shake *** examination,plasma flow injection is simulated in the multihierarchy *** is observed that plasmas flow from a macro-hierarchy to a microhierarchy across the magnetic field smoothly and continuously.

关键词： Multi-hierarchy simulation magnetic reconnection MHD PIC