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Comparison of Carbon Dynamics among Three Cool-Temperate Forests (<i>Quercus serrata, Larix kaempferi</i>and <i>Pinus densiflora</i>) under the Same Climate Conditions in Japan

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Journal of Environmental Protection 2019年第7期10卷 929-941页

作者： Mitsutoshi Tomotsune Yohei Suzuki Yuki Kato Rina Masuda Nobuhiko Suminokura yuta koyama Yoshiaki Sakamaki Hiroshi Koizumi Faculty of Education and Integrated Arts and Science Waseda University Tokyo Japan Faculty of Science and Engineering Waseda University Tokyo Japan Waseda Research Institute for Science and Engineering Waseda University Tokyo Japan

To understand the role of forest ecosystems in the global carbon cycle, it is important to clarify the factors affecting the carbon balance of forest ecosystems. However, little is known about the direct effect of forest types, especially dominant species, on their different carbon dynamics. To clarify the effect of difference in forest types, an experiment was conducted in three forests, which were located in the same place and exposed to the same climate conditions. These forests were middle-aged (40 - 45 years) and dominated by Quercus serrata (Q forest), Larix kaempferi (L forest) and Pinus densiflora (P forest). Net primary production (NPP), heterotrophic respiration (HR) and net ecosystem production (NEP) were estimated in each forest, using a biometric method over one year. For NPP estimated from the annual growth of tree biomass (ΔB) and amount of litter (LF), P forest NPP (5.3 MgC·ha-1·yr-1) was higher than Q and L forest NPP (4.6 and 3.2 MgC·ha-1·yr-1). The difference was affected by a significant difference in ΔB (p = 0.032) and LF (p -1·yr-1) was higher than L and P forest (2.3 and 2.1 MgC·ha-1·yr-1). This difference could result from the amount of litter (respiration substrate) and chemical properties of litter (lability of decomposition). The NEP, which was calculated from the difference between NPP and HR, varied widely among the forest types (0.5, 0.9 and 3.2 MgC·ha-1·yr-1 in Q, L and P forests, respectively). The range of values among the forest types was comparable to those among age sequences and climate zones in previous studies. These results suggest that the difference in forest types (especially dominant species) can potentially lead to a large variation in carbon dynamics, in ecosystems located in the same place.

关键词： Dominant Species Functional Type Heterotrophic Respiration Net Ecosystem Production Net Primary Production

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Research in Astronomy and Astrophysics 2021年第5期21卷 43-70页

作者： yuta Ito Department of Physics The Graduate Center of CUNY365 Fifth AvenueNew YorkNY 10016USA Department of Physics and Astronomy The College of Staten Island of CUNY2800 Victory BoulevardStaten IslandNY 10314USA

Fitting parametric models to globular clusters’structural profiles has been essential for the study of stellar *** provides their important structural parameters,such as the concentrations and core radii of the ***,existing parametric models can apply only to non-collapsing-core clusters in the early relaxation-evolution ***,a single parametric model cannot provide globular clusters’structural parameters in both the early and late evolution *** have recently found an accurate spectral solution for the self-similar orbit-averaged Fokker-Planck(OAFP)equation to model collapsingcore clusters at the late evolution *** present work establishes a new parametric model by combining the self-similar OAFP-and *** it is a single-mass and isotropic model,the new model applies to at least fifty-five Galactic globular clusters with resolved cores in all the evolution *** a main result,we show the characteristics of the relaxation times against the concentrations of the *** also affirm that the structures of low-concentration clusters are polytropic in the Milky Way.

关键词： (Galaxy:)globular clusters:general Galaxy:kinematics and dynamics methods:numerical

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Drag-reduction behavior of an unusual nonionic surfactant in a circular pipe turbulent flow

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Journal of Hydrodynamics 2014年第3期26卷 400-405页

作者：蔡书鹏 HIGUCHI yuta Institute of High Pressure Water Jet Hunan University of Technology Graduate School of Science and Technology Kobe University

The Alkyl Polyglucoside（APG） is a nonionic surfactant with no toxicity and with high biodegradability, its drag-reduction behavior in a circular pipe flow is measured, and the rheological characteristics are investigated with a rheometer with a cone-plate flow cell. From the measured results, the APG is shown to have a high drag-reduction capacity, whose shear viscosity is shear-ratedependent at high concentrations, while its solution at concentrations with drag-reduction effects is non-viscoelastic as verified by zero relaxation time in the relaxation process of the shear stress, which contradicts the general viewpoint that there is a correlation between the viscoselastic characteristics and the turbulent drag reduction for the drag-reduction surfactant. However, the APG solution is birefringent as observed through a birefringent test, which indicates that there are rod-shaped micelles in the solution under the shearing flow. The higher extensional viscosity inferred from the extensional phenomenon observed in the measurements of the shear viscosity could be responsible for the drag reduction property of this nonionic surfactant.

关键词： drag reduction shear stress relaxation relaxation time viscoelasticity

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Solid pseudopapillary neoplasm of the pancreas in a young male with main pancreatic duct dilatation: A case report

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World Journal of Clinical Cases 2021年第36期9卷 11382-11391页

作者： Saki Nakashima Yoshiki Sato Tsunao Imamura Daisuke Hattori Tetsuo Tamura Rikako koyama Junichiro Sato yuta Kobayashi Masaji Hashimoto Department of Neurology The University of Tokyo HospitalBunkyo-ku 113-8655TokyoJapan Department of Gastroenterology Toranomon HospitalTokyo 105-0001Japan Department of Pathology Toranomon HospitalTokyo 105-0001Japan Department of Gastrointestinal Surgery Toranomon HospitalTokyo 105-0001Japan

BACKGROUND Solid pseudopapillary neoplasms(SPNs)are rare tumors of the ***,they occur in young females,often have characteristic imaging features,such as cystic components and calcification,and have few effects on the pancreatic *** SUMMARY A 31-year-old man was admitted to our hospital with the chief complaint of epigastric *** was only mild tenderness in his upper abdomen,and blood tests showed only a slight increase in alkaline ***-enhanced computed tomography showed a 40-mm-diameter,hypovascular mass in the head of the pancreas,and the main pancreatic duct upstream of the mass was severely *** resonance imaging showed low intensity on T1-weighted images,with high intensity on T2-weighted image in some *** ductal adenocarcinoma was the primary differential *** vein infiltration could not be ruled out,so this case was a candidate for neoadjuvant ***,endoscopic ultrasound-guided fine needle aspiration was performed,and pathological evaluation and immunostaining suggested a diagnosis of ***,pancreatoduodenectomy was *** year after the operation,the patient is alive with no *** Main pancreatic duct dilatation is usually a finding of suspected pancreatic ***,pancreatic duct dilatation can occur in SPN depending on the location and growth ***,SPN should be considered in the differential diagnosis of tumors with pancreatic duct dilatation,and pathological evaluation by endoscopic ultrasound-guided fine needle aspiration should be actively performed.

关键词： Solid pseudopapillary neoplasm Endoscopic ultrasound-guided fine-needle aspiration Main pancreatic duct dilatation Male Case report

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Lepton mass matrix from double covering of A_(4) modular flavor symmetry

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Chinese Physics C 2022年第12期46卷 162-171页

作者： Hiroshi Okada yuta Orikasa Asia Pacific Center for Theoretical Physics(APCTP)-Headquarters San 31 Hyoja-dongNam-guPohang 790-784Korea Department of Physics Pohang University of Science and TechnologyPohang 37673Republic of Korea Institute of Experimental and Applied Physics Czech Technical University in PragueHusova 240/511000 Prague 1Czech Republic

We study a double covering of modular A_(4)flavor *** this end,we construct lepton models for canonical and radiative seesaw *** irreducible doublet representations,heavier Majorana fermion masses are characterized by one free parameter that would differentiate from A_(4)***χsquare numerical analysis,we demonstrate that both scenarios produce some predictions in case of normal hierarchy reproducing neutrino oscillation ***,no solution satisfies the neutrino oscillation data in case of radiative seesaw of inverted hierarchy.

关键词： flavor physics neutrino and Lepton mass beyond the standard model

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MicroRNA-based targeting of the Rho/ROCK pathway in therapeutic strategies after spinal cord injury

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Neural Regeneration Research 2023年第2期18卷 311-312页

作者： Tetsu Kimura yuta Horikoshi Department of Anesthesia and Intensive Care Medicine Akita University Graduate School of MedicineAkitaJapan

Spinal cord injury(SCI)is one of the leading causes of disability and is a devastating condition that requires long-term care,reduces social productivity,and gives an immense emotional burden on patients and their fa *** frequently occurs due to traffic accidents,falls,slips,violence,sports,and medical accidents in today's *** initial mechanical damage triggers a secondary injury cascade that induces more intractable damage(Silva et al.,2014).Secondary injury mechanisms have been postulated,including neuronal apoptosis,inflammation,oxidative stress,and excitotoxicity.

关键词： damage injury emotional

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Is the magic texture of Majorana neutrinos immanent in Dirac nature?

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Chinese Physics C 2023年第4期47卷 66-73页

作者： yuta Hyodo Teruyuki Kitabayashi Graduate School of Science and Technology Tokai University4-1-1 KitakanameHiratsukaKanagawa 259-1292Japan Department of Physics Tokai University4-1-1 KitakanameHiratsukaKanagawa 259-1292Japan

Magic textures are successful candidates of the correct texture for Majorana *** this study,we demonstrate that several types of magic textures of Majorana neutrinos are approximately immanent in the flavor mass matrix of Dirac *** addition,the normal mass ordering of Dirac neutrino masses is slightly preferable to inverted mass ordering in the context of magic textures.

关键词： neutrino mixing mass matrix magic texture

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Counter-Rotating Type Tidal Stream Power Unit Boarded on Pillar(Performances and Flow Conditions of Tandem Propellers)

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Journal of Thermal Science 2013年第6期22卷 580-585页

作者： yuta Usui Toshiaki Kanemoto Koju Hiraki Kyushu Institute of Technology: Sensui 1-1 TobataKitakyushuFukuoka804-8550Japan

The authors have invented the unique counter-rotating type tidal stream power unit composed of the tandem pro- peUers and the double rotational armature type peculiar generator without the traditional stator. The front and the rear propellers counter-drive the inner and the outer armatures of the peculiar generator, respectively. The unit has the fixftful advantages that not only the output is sufficiently higher without supplementary equipment such as a gearbox, but also the rotational moment hardly act on the pillar because the rotational torque of both propel- lers/armatures are counter-balanced in the unit. This paper discusses experimentally the performances of the power unit and the effects of the propeller rotation on the sea surface. The axial force acting on the pillar in- creases naturally with the increase of not only the stream velocity but also the drag of the tandem propellers. Be- sides, the force vertical to the stream also acts on the pillar, which is induced from the Karman vortex street and the dominant frequencies appear owing to the front and the rear propeller rotations. The propeller rotating in close to the sea surface brings the abnormal wave and the amplitude increases as the stream velocity is faster and/or the drag is stronger.

关键词： Tidal stream Counter rotation Tandem propellers Generator Armature

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Large Eddy Simulation of Methane Non-premixed Flame Using the Laminar Flamelet Model

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Journal of Thermal Science 2011年第6期20卷 534-542页

作者： Mari Mitani yuta Ito Nobuhiko Yamasaki Department of Aeronautics and Astronautics Kyushu University

The large eddy simulation (LES) using the steady laminar flamelet model is applied to a simple turbulent jet flame with 33.2% H2,22.1% CH4 and 44.7% N2 at the Reynolds number of 15,200 in order to validate the numerical methods and to investigate the flame *** the validation,the detailed experimental data of DLR-A flame is *** numerical results are in reasonable agreement with experimental results except mass fractions of minor *** the flow field,the break-down of the potential core,the vortex structure and the mixing intensity are well *** the combustion field,mass fractions of major species (H2O,CO2,CO) are well predicted *** species are well predicted *** the present study,the simulations conducted on the Cartesian and cylindrical grids with approximately 6.6× 10 5 nodes are compared.

关键词： Cartesian grid cylindrical grid validation calculation

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Bin-scanning:Segmentation of X-ray CT volume of binned parts using Morse skeleton graph of distance transform

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Computational Visual Media 2023年第2期9卷 319-333页

作者： yuta Yamauchi Tatsuya Yatagawa yutaka Ohtake Hiromasa Suzuki School of Engineering The University of Tokyo7–3–1HongoBunkyo-kuTokyoJapan

X-ray CT scanners,due to the transmissive nature of X-rays,have enabled the non-destructive evaluation of industrial products,even inside their *** light of its effectiveness,this study introduces a new approach to accelerate the inspection of many mechanical parts with the same shape in a *** input to this problem is a volumetric image(i.e.,CT volume)of many parts obtained by a single CT *** need to segment the parts in the volume to inspect each of them;however,random postures and dense contacts of the parts prohibit part segmentation using traditional template *** address this problem,we convert both the scanned volumetric images of the template and the binned parts to simpler graph structures and solve a subgraph matching problem to segment the *** perform a distance transform to convert the CT volume into a distance ***,we construct a graph based on Morse theory,in which graph nodes are located at the extremum points of the distance *** experimental evaluation demonstrates that our fully automatic approach can detect target parts appropriately,even for a heap of 50 ***,the overall computation can be performed in approximately 30 min for a large CT volume of approximately 2000×2000×1000 voxels.

关键词： X-ray computed tomography(CT) volume segmentation graph matching non-destructive inspection

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