Takuya Kawahara
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View article: Successful treatment for distal-arch aortic aneurysm in a cold agglutinin-positive patient via physician-modified thoracic endovascular aortic repair: a case report
Successful treatment for distal-arch aortic aneurysm in a cold agglutinin-positive patient via physician-modified thoracic endovascular aortic repair: a case report Open
Background Cold agglutinin disease (CAD) is sometimes incidentally detected before cardiovascular surgery. Several methods to prevent complications associated with CAD after cardiac surgery have been reported, but there are no reports of t…
View article: Prevalence and risk surveillance of anti-mitochondrial antibody-positive myositis: Outcomes of a nationwide survey
Prevalence and risk surveillance of anti-mitochondrial antibody-positive myositis: Outcomes of a nationwide survey Open
AMA-positive myositis is characterized by severe and urgent organ complications, and anticipatory management is critical for management of this disease.
View article: Influence of meteoric smoke particles on the incoherent scatter measured with EISCAT VHF
Influence of meteoric smoke particles on the incoherent scatter measured with EISCAT VHF Open
Meteoric ablation in the Earth's atmosphere produces particles of nanometer size and larger. These particles can become charged and influence the charge balance in the D region (60–90 km) and the incoherent scatter observed with radar from…
View article: A case of carotid-axillary bypass for subclavian steal syndrome in an 83-year-old female undergoing hemodialysis
A case of carotid-axillary bypass for subclavian steal syndrome in an 83-year-old female undergoing hemodialysis Open
View article: Comment on angeo-2023-29
Comment on angeo-2023-29 Open
Abstract. Meteoric ablation in the Earth’s atmosphere produces particles of nanometer-size and larger. These particles can become charged and influence the charge balance in the D-region (60–90 km) and the incoherent scatt…
View article: Comment on angeo-2023-29
Comment on angeo-2023-29 Open
Abstract. Meteoric ablation in the Earth’s atmosphere produces particles of nanometer-size and larger. These particles can become charged and influence the charge balance in the D-region (60–90 km) and the incoherent scatt…
View article: Influence of Meteoric Smoke Particles on the Incoherent Scatter Measured with EISCAT VH
Influence of Meteoric Smoke Particles on the Incoherent Scatter Measured with EISCAT VH Open
Meteoric ablation in the Earth’s atmosphere produces particles of nanometer-size and larger. These particles can become charged and influence the charge balance in the D-region (60–90 km) and the incoherent scatter observed with radar from…
View article: A statistical study of convective and dynamic instabilities in the polar upper mesosphere above Tromsø
A statistical study of convective and dynamic instabilities in the polar upper mesosphere above Tromsø Open
We have studied the convective (or static) and dynamic instabilities between 80 and 100 km above Tromsø (69.6° N, 19.2° E) using temperature and wind data of 6 min and 1 km resolutions primarily almost over a solar cycle obtained with the …
View article: Automated harvesting by a dual-arm fruit harvesting robot
Automated harvesting by a dual-arm fruit harvesting robot Open
View article: A Case of Floating Mural Thrombus Management in Abdominal Aortic Aneurysm Using Effective Echography
A Case of Floating Mural Thrombus Management in Abdominal Aortic Aneurysm Using Effective Echography Open
89歳女性。心房細動に対しDOACを内服していた。B型急性大動脈解離および腹部大動脈瘤（40 mm）の診断で緊急入院しDOACは中止した。入院後8日目に腹部大動脈瘤内に新規の浮遊血栓を認めたが，高齢，フレイルのため保存的加療とし血栓は3カ月で消失した。腹部大動脈瘤内の浮遊血栓は高感度ドップラーを併用した腹部超音波で低エコーとAC signが混在している場合，保存的加療を選択しえると考えられた。
View article: Fruit recognition method for a harvesting robot with RGB-D cameras
Fruit recognition method for a harvesting robot with RGB-D cameras Open
In this study, we present a recognition method for a fruit-harvesting robot to automate the harvesting of pears and apples on joint V-shaped trellis. It is necessary to recognize the three-dimensional position of the harvesting target for …
View article: Automated harvesting by a dual-arm fruit harvesting robot
Automated harvesting by a dual-arm fruit harvesting robot Open
In this study, we propose a method to automate fruit harvesting with a fruit harvesting robot equipped with robotic arms. Given the future growth of the world population, food shortages are expected to accelerate. Since much of Japan’s agr…
View article: Fruit Recognition Method for a Harvesting Robot with RGB-D Cameras
Fruit Recognition Method for a Harvesting Robot with RGB-D Cameras Open
In this study, we present a recognition method for a fruit-harvesting robot to automate the harvesting of pears and apples on joint V-shaped trellis. It is necessary to recognize the three-dimensional position of the harvesting target for …
View article: Polaron Masses in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>CH</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub><mml:msub><mml:mrow><mml:mi>NH</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub><mml:mi>Pb</mml:mi><mml:msub><mml:mrow><mml:mi>X</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math> Perovskites Determined by Landau Level Spectroscopy in Low Magnetic Fields
Polaron Masses in Perovskites Determined by Landau Level Spectroscopy in Low Magnetic Fields Open
We investigate the electron-phonon coupling in CH_{3}NH_{3}PbX_{3} lead halide perovskites through the observation of Landau levels and high-order excitons at weak magnetic fields, where the cyclotron energy is significantly smaller than t…
View article: Formation of an additional density peak in the bottom side of the sodium layer associated with the passage of multiple mesospheric frontal systems
Formation of an additional density peak in the bottom side of the sodium layer associated with the passage of multiple mesospheric frontal systems Open
We present a detailed investigation of the formation of an additional sodium density peak at altitudes of 79–85 km below the main peak of the sodium layer based on sodium lidar and airglow imager measurements made at Ramfjordmoen near Trom…
View article: Relationship between Na layer and CNA variations observed at Syowa, Antarctic
Relationship between Na layer and CNA variations observed at Syowa, Antarctic Open
We have performed a statistical data analysis on relationship between simultaneous Na density data and cosmic noise absorption (CNA) data, which is an indicator for energetic particle precipitation, obtained at Syowa, Antarctic in 2000–200…
View article: Optimizarion of harvesting operation of a fruit harvesting robot with slide mechanism
Optimizarion of harvesting operation of a fruit harvesting robot with slide mechanism Open
Recently, aging and the labor shortage of the agriculture employee progress in Japan. Therefore, new machines and robots for harvesting are required. In this paper, we propose a method of automated harvesting fruit such as apples by redund…
View article: Fruit position recognition and ripeness determination methods for a fruit automatic harvesting robot
Fruit position recognition and ripeness determination methods for a fruit automatic harvesting robot Open
The purpose of this research is to automate the harvesting of pears and apples on V shaped joint trees using a fruit harvesting robot. For harvesting by the fruit harvesting robot, the position of the harvesting target is first detected th…
View article: Formation of a bottomside secondary sodium layer associated with the passage of multiple mesospheric frontal systems
Formation of a bottomside secondary sodium layer associated with the passage of multiple mesospheric frontal systems Open
We present a detailed investigation of the formation of a secondary sodium layer at altitudes of 79–85 km below the main sodium layer based on sodium lidar and airglow imager measurements made at Ramfjordmoen near Tromsø, Norway on the nig…
View article: Polaron Mass and Exciton Energy of CH3NH3PbX3 Revealed by Landau Level Spectroscopy Under Low Magnetic Fields
Polaron Mass and Exciton Energy of CH3NH3PbX3 Revealed by Landau Level Spectroscopy Under Low Magnetic Fields Open
We investigate the electron-phonon coupling of CH3NH3PbX3 lead halide perovskites through the observation of Landau levels and high-order excitons under weak magnetic fields, where the cyclotron energy is sufficiently smaller than the LO p…
View article: Exciton binding energy of CH3NH3PbX3 under low magnetic field: implications of strong exciton-phonon coupling
Exciton binding energy of CH3NH3PbX3 under low magnetic field: implications of strong exciton-phonon coupling Open
View article: Observations of Metallic Layers in the Earth’s Upper Atmosphere Based on Resonance-Scattering Lidars
Observations of Metallic Layers in the Earth’s Upper Atmosphere Based on Resonance-Scattering Lidars Open
Metallic layers, containing such elements as Na, K, Li, Ca, and Fe, originating from meteors are valuable tracers for performing observations of the Earth's upper atmosphere. The present paper provides a brief review of resonance-scatterin…
View article: Automated selection of thinned pears by using multi-view stereo
Automated selection of thinned pears by using multi-view stereo Open
Recently, mechanization and automation of farming are required. However, they have not been improved enough. To thin out young pears with robot arms, it is needed to detect and localize fruits’ positions and sizes. In this paper, the metho…
View article: On the Long Lasting “C‐Type” Structures in the Sodium Lidargram: The Lifetime of Kelvin‐Helmholtz Billows in the Mesosphere and Lower Thermosphere Region
On the Long Lasting “C‐Type” Structures in the Sodium Lidargram: The Lifetime of Kelvin‐Helmholtz Billows in the Mesosphere and Lower Thermosphere Region Open
In order to understand the characteristics of long‐lasting “C‐type” structure in the Sodium (Na) lidargram, six cases from different observational locations have been analyzed. The Na lidargram, collected from low‐, middle‐, and high‐latit…
View article: Vertical fine structure and time evolution of plasma irregularities in the E s layer, observed by a high resolution Ca + lidar
Vertical fine structure and time evolution of plasma irregularities in the E s layer, observed by a high resolution Ca + lidar Open
The Ninth Symposium on Polar Science/Interdisciplinary sessions: [IW] Whole atmosphere, Thu. 6 Dec. / Entrance Hall (1st floor), National Institute of Polar Research
View article: Vertical fine structure and time evolution of plasma irregularities in the Es layer observed by a high-resolution Ca+ lidar
Vertical fine structure and time evolution of plasma irregularities in the Es layer observed by a high-resolution Ca+ lidar Open
The vertical fine structures and the time evolution of plasma irregularities in the sporadic E (E s) layer were observed via calcium ion (Ca+) density measurements using a resonance scattering lidar with a high time-height resolution (5 s …
View article: Rayleigh/Raman lidar observations of gravity wave activity from 15 to 70 km altitude over Syowa (69°S, 40°E), the Antarctic
Rayleigh/Raman lidar observations of gravity wave activity from 15 to 70 km altitude over Syowa (69°S, 40°E), the Antarctic Open
The potential energy of gravity waves (GWs) per unit mass ( E p ), at altitudes of 15–70 km, has been examined from temperature profiles obtained by a Rayleigh/Raman lidar at Syowa Station (69°S, 40°E) from May 2011 to October 2013, with t…
View article: Sodium temperature/wind lidar based on laser-diode-pumped Nd:YAG lasers deployed at Tromsø, Norway (696°N, 192°E)
Sodium temperature/wind lidar based on laser-diode-pumped Nd:YAG lasers deployed at Tromsø, Norway (696°N, 192°E) Open
An Nd:YAG laser-based sodium temperature/wind lidar was developed for the measurement of the northern polar mesosphere and lower thermosphere at Tromsø (69.6N, 19.2E), Norway. Coherent light at 589 nm is produced by sum frequency generatio…
View article: A thermospheric Na layer event observed up to 140 km over Syowa Station (69.0°S, 39.6°E) in Antarctica
A thermospheric Na layer event observed up to 140 km over Syowa Station (69.0°S, 39.6°E) in Antarctica Open
We report a thermospheric Na layer event (up to 140 km) observed by lidar in the night of 23–24 September 2000 at Syowa (69.0°S, 39.6°E), Antarctica. The thermospheric Na number densities were 2–9 cm −3 at 110–140 km, 3 orders of magnitude…