Akira Mizuno
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View article: A Simulation Study on the Cosmic-Ray Energy Spectra of Elemental Mass Groups using the Tibet Air-Shower and Muon Detector Arrays through the Bayesian Unfolding Method
A Simulation Study on the Cosmic-Ray Energy Spectra of Elemental Mass Groups using the Tibet Air-Shower and Muon Detector Arrays through the Bayesian Unfolding Method Open
We study the analysis method to determine the cosmic-ray energy spectra of different mass groups assuming the use of the Tibet AS$\gamma$ experiment, which consists of the high-density Tibet air-shower array and the underground muon detect…
View article: Experimental Verification of a Convolutional Neural Network Separation Method in TeV Gamma-Ray Observations by the Tibet ASγ Experiment
Experimental Verification of a Convolutional Neural Network Separation Method in TeV Gamma-Ray Observations by the Tibet ASγ Experiment Open
Since 1990, the Tibet AS$\gamma$ experiment has been observing gamma rays and cosmic rays with energies greater than several TeV using a surface air shower array. An underground muon detector (MD) array operating since 2014 enables us to s…
View article: An Interpretation of Sub-PeV Galactic Diffuse Gamma-Ray Observations by the Tibet ASγ Experiment and LHAASO
An Interpretation of Sub-PeV Galactic Diffuse Gamma-Ray Observations by the Tibet ASγ Experiment and LHAASO Open
View article: A Discussion on the Origin of the Sub-PeV Galactic Gamma-Ray Emission
A Discussion on the Origin of the Sub-PeV Galactic Gamma-Ray Emission Open
Galactic diffuse gamma-ray flux measured by the Tibet AS γ experiment and the total Galactic gamma-ray flux measured by the Large High Altitude Air Shower Observatory (LHAASO) are found to be consistent, within the statistical and systemat…
View article: ALPACA project to observe sub-PeV gamma-ray sky in the southern hemisphere
ALPACA project to observe sub-PeV gamma-ray sky in the southern hemisphere Open
View article: $$\gamma $$/hadron discrimination by analysis of the muon lateral distribution and the ALPAQUITA array
$$\gamma $$/hadron discrimination by analysis of the muon lateral distribution and the ALPAQUITA array Open
A new method using the muon lateral distribution and an underground muon detector to achieve high discrimination power against hadrons is presented. The method is designed to be applied in the Andes Large-area PArticle detector for Cosmic-…
View article: A new air shower array in the Southern Hemisphere looking for the origins of Cosmic rays: the ALPACA experiment
A new air shower array in the Southern Hemisphere looking for the origins of Cosmic rays: the ALPACA experiment Open
The Tibet AS$γ$ experiment successfully detected sub-PeV $γ$-rays from the Crab nebula using a Surface Array and underground muon detector. Considering this, we are building in Bolivia a new experiment to explore the Southern Hemisphere, l…
View article: Quantitative Constraint on the Contribution of Resolved Gamma-Ray Sources to the Sub-PeV Galactic Diffuse Gamma-Ray Flux Measured by the Tibet ASγ Experiment
Quantitative Constraint on the Contribution of Resolved Gamma-Ray Sources to the Sub-PeV Galactic Diffuse Gamma-Ray Flux Measured by the Tibet ASγ Experiment Open
Motivated by the difference between the fluxes of sub-PeV Galactic diffuse gamma-ray emission (GDE) measured by the Tibet AS γ experiment and the LHAASO collaboration, our study constrains the contribution to the GDE flux measured by Tibet…
View article: Modeling of TeV Galactic Cosmic-ray Anisotropy based on Intensity Mapping in an MHD Model Heliosphere
Modeling of TeV Galactic Cosmic-ray Anisotropy based on Intensity Mapping in an MHD Model Heliosphere Open
Cosmic rays do not arrive at the Earth uniformly. Recent experiments have consistently observed small anisotropies with amplitudes of ∼0.2% in the arrival directions of cosmic rays at TeV energies. We perform the modeling of the cosmic-ray…
View article: On the source contribution to the Galactic diffuse gamma rays above 398 TeV detected by the Tibet ASγ experiment
On the source contribution to the Galactic diffuse gamma rays above 398 TeV detected by the Tibet ASγ experiment Open
Potential contribution from gamma-ray sources to the Galactic diffuse gamma rays observed above 100 TeV (sub-PeV energy range) by the Tibet ASγ experiment is an important key to interpreting recent multi-messenger observations. This paper …
View article: On the Source Contribution to the Galactic Diffuse Gamma Rays above 398 TeV Detected by the Tibet ASγ Experiment
On the Source Contribution to the Galactic Diffuse Gamma Rays above 398 TeV Detected by the Tibet ASγ Experiment Open
Potential contribution from gamma-ray sources to the Galactic diffuse gamma rays observed above 100 TeV (sub-PeV energy range) by the Tibet AS γ experiment is an important key to interpreting recent multimessenger observations. This paper …
View article: Quantitative constraint on the source contribution to the Galactic diffuse gamma rays detected by the Tibet air shower array
Quantitative constraint on the source contribution to the Galactic diffuse gamma rays detected by the Tibet air shower array Open
The fraction of the contribution from yet-unresolved gamma-ray sources in the Galactic diffuse gamma rays observed by the Tibet air shower array is an important key to interpreting recent multi-messenger observations. This paper shows a su…
View article: Observation of gamma rays from the northern celestial sky up to the sub-PeV range with the Tibet air shower array and its underground muon detector array
Observation of gamma rays from the northern celestial sky up to the sub-PeV range with the Tibet air shower array and its underground muon detector array Open
Gamma-ray observation in the sub-PeV range helps us search for Galactic PeV cosmic-ray accelerators, PeVatrons. Measurement of the energy spectrum of gamma rays from astrophysical sources is especially crucial to discuss their hadronic or …
View article: A Case of Impacted Obturator Hernia Treated by Elective Laparoscopic Repair After Manual Reduction
A Case of Impacted Obturator Hernia Treated by Elective Laparoscopic Repair After Manual Reduction Open
症例は86歳女性。19時30分頃からの右股関節痛あり20時に受診。腹部軽度膨満軟，右股関節に圧痛を認めた。CTで右閉鎖孔内に嵌頓した小腸を認め，右閉鎖孔ヘルニア嵌頓と診断した。発症早期であり，腸管壊死の可能性は低いと判断して用手的に整復を行なった。施行後，右股関節痛は速やかに改善し，CTで腸管の陥入は解除されていた。待機的に腹腔鏡下の手術を行なった。腹腔内には血性腹水を認めたが，明らかな腸管虚血は認めず。腸管の拡張は解除されており，良好な視野にて手術操作が行なえた。術後経過…
View article: Development of the new multi-beam receiver and telescope control system for NASCO
Development of the new multi-beam receiver and telescope control system for NASCO Open
We report the current status of the NASCO (NAnten2 Super CO survey as legacy) project which aims to provide all-sky CO data cube of southern hemisphere using the NANTEN2 4-m submillimeter telescope installed at the Atacama Desert through d…
View article: A Case of Laparoscopic Colostomy in a Patient With Defecation Disorder Due to Spinal Cord Injury
A Case of Laparoscopic Colostomy in a Patient With Defecation Disorder Due to Spinal Cord Injury Open
症例は73歳，男性。40歳の時に労災事故で脊髄損傷を患い，下半身麻痺で生活を送っている。以前より，腸管蠕動不良とS状結腸の通過障害による排便障害を来していたが，入院管理を要するまでに悪化したため，人工肛門造設術の適応となった。 事故時に横隔膜損傷治療のための開胸・開腹術を受けており，腹腔内に癒着の存在が予想され，癒着剥離を要する可能性が高かった。また，脊髄損傷患者は腸管蠕動不良を来しやすく，術後麻痺性イレウス予防のために可能な限り手術侵襲を低減することを目的に，腹腔鏡下手術…
View article: Two Cases of Colorectal Cancer with Intussusception Prolapse Through the Anus
Two Cases of Colorectal Cancer with Intussusception Prolapse Through the Anus Open
症例1：73歳女性。腹痛と肛門からの腸管脱出を主訴に受診。肛門外へ約10cm腸管が脱出し，先進部に腫瘤を認めた。CTでS状結腸が直腸内に進入し，同心円状構造target signを認めた。症例2：92歳女性。下血を主訴に受診。肛門外へ約5cm腸管が脱出し，先進部に腫瘤を認めた。CTで直腸の同心円状構造target signを認めた。2例ともCT所見・身体所見より大腸癌が先進したことによる腸重積と診断した。術前に徒手整復を試みたが還納できず，ハルトマン手術を施行した。症例1は…
View article: Suture‐induced arthritis as a clinical mimicker of septic arthritis
Suture‐induced arthritis as a clinical mimicker of septic arthritis Open
Key Clinical Message Foreign body‐induced arthritis is a rare etiology of mono‐arthritis. It should be suspected in the case of postoperative arthritis, even if some decades have passed since surgery. Histopathology of the tissues is requi…
View article: Two-axis Gimbal with Passive Revolute Joints for Motion Isolation of a Stabilizing Mechanism
Two-axis Gimbal with Passive Revolute Joints for Motion Isolation of a Stabilizing Mechanism Open
Energy efficiency is a salient design consideration for stabilization mechanisms when assembled on a battery-powered vehicle.In this paper we study the implementation of a two-axis gimbal with passive revolute joints for motion isolation o…
View article: Synchronous Multiple Distal Bile Duct Cancer in a Patient Who Had Worked in the Printing Industry
Synchronous Multiple Distal Bile Duct Cancer in a Patient Who Had Worked in the Printing Industry Open
症例は56歳の男性で，有機溶媒を使用する印刷会社に勤務している．1か月前から続く上腹部痛を主訴に近医を受診した．軽度肝機能異常を指摘され，当院を紹介受診となった．各種画像検査にて三管合流部と下部胆管に，それぞれ腫瘍性病変を認め，生検にて両者とも腺癌が検出された．中部胆管，下部胆管の多発癌と診断し，亜全胃温存膵頭十二指腸切除術を行った．摘出標本では，膵胆管合流異常は認めず，中部胆管，下部胆管に，それぞれ中分化型腺癌と高分化型腺癌を認めた．両者の間には肉眼的，病理学的に連続性を…
View article: A DETAILED STUDY OF NON-THERMAL X-RAY PROPERTIES AND INTERSTELLAR GAS TOWARD THE γ-RAY SUPERNOVA REMNANT RX J1713.7–3946
A DETAILED STUDY OF NON-THERMAL X-RAY PROPERTIES AND INTERSTELLAR GAS TOWARD THE γ-RAY SUPERNOVA REMNANT RX J1713.7–3946 Open
International audience
View article: [Paper] Smooth Gradation Reconstruction from False Contours in Quantized Natural Image
[Paper] Smooth Gradation Reconstruction from False Contours in Quantized Natural Image Open
We propose a bit-depth expansion (BDE) method targeting natural images. In the analog part of an imaging system, signal intensity fluctuations occur due to noise (e.g. thermal noise in the image sensor). After that, in the digital part, th…