Search Results 1-20 of 133

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Wellposedness and Asymptotic Behavior of the Perturbed Nonlinear Schrödinger Equation with Kerr Law Nonlinearity and Localized Damping

Zhang Zaiyun , Liu Zhenhai , Sun Mingbao

… [8], we derive smooth estimates and establish the exponential decay by using the multiplier techniques and the so-called compactness-uniqueness technique. … Secondly, we extend the local solution to the global solution by using some priori estimates. … Finally, we establish the exponential decay of the solution of nonlinear problem by using Sobolev inequality and Unique Continuation Principle. …

Funkcialaj Ekvacioj 63(3), 293-322, 2020

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2

Uniform Energy Decay for Wave Equations with Unbounded Damping Coefficients

Ikehata Ryo , Takeda Hiroshi

… For a general class of unbounded damping coefficients, we derive uniform total energy decay estimates together with a unique existence result of a weak solution. …

Funkcialaj Ekvacioj 63(1), 133-152, 2020

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3

EXPLORING THE SUPPLY AND DEMAND RELATIONSHIP OF MEDICAL SERVICES FOR EACH DIAGNOSIS-RELATED GROUP

XU Feifan , ZHAO Shichen , YAMAMOTO Ryuta

… As a limitation of this research, it does not directly take into account the operational elements such as letters of introduction. 2) In this study, we developed a model that estimates the number of patients for each diagnostic group by considering the locations and attributes of hospitals. …

Journal of Architecture and Planning (Transactions of AIJ) 85(769), 637-646, 2020

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4

Groundwater flow traced by bomb pulses of ³⁶Cl and tritiogenic ³He in a borehole

Mahara Yasunori , Ohta Tomoko

… Fresh drill-core and groundwater samples were collected from the borehole for estimating global fallout bomb pulses of ³H, which becomes tritiogenic ³He (tri³He) through β-decay, and ³⁶Cl. … Although the two velocity estimates differ by 10–15%, it is possible to model groundwater flow in the tableland as downward piston flow without diffusion. …

Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms (455), 140-145, 2019-09-15

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A SYSTEM OF NONLINEAR SCHRODINGER EQUATIONS WITH DELTA-FUNCTIONS AS INITIAL DATA (常微分方程式の定性的理論および数理モデル研究への応用)

Kita Naoyasu , Shimizu Shoji

… But this paper removes the coincidence of the powers of nonlinearities, classifies the decay estimates of the global solutions in cases of dissipative nonlinearities, and proves the existence of blowing-up solution in cases that both nonlinearities are amplification. …

数理解析研究所講究録 (2122), 76-91, 2019-07

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6

QUALIFICATION OF TENSIONED METASTABLE FLUID DETECTORS FOR SPECTROSCOPIC RADON & PROGENY DETECTION UNDER RANGE OF ENVIRONMENTAL CONDITIONS

Hemesath Mitchell P. , Archambault Brian C. , Boyle Nathan M. , Taleyarkhan Rusi P.

… Radon gas is an alpha emitting nuclide often found in homes and buildings from the 238U decay chain. … The USEnvironmental Protection Agency (EPA) estimates that radon and its progeny are the cause of over 21,000 annual deaths from lung cancer in the United States alone. … Under tailored metastable state, the fluid becomes sensitive to the recoil nuclei during alpha decay. …

The Proceedings of the International Conference on Nuclear Engineering (ICONE) 2019.27(0), 1253, 2019

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7

Large time behavior of a generalized Oseen evolution operator, with applications to the Navier–Stokes flow past a rotating obstacle

Hishida Toshiaki

… In this paper we develop the L^q-L^r decay estimates of the evolution operator T(t, s) as (t−s)→∞ and then apply them to the Navier–Stokes initial value problem.ファイル公開：2019/12/01 …

Mathematische Annalen 372(3-4), 915-949, 2018-12

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8

Spatiotemporal land use random forest model for estimating metropolitan NO₂ exposure in Japan

Araki Shin , Shima Masayuki , Yamamoto Kouhei

… Adequate spatial and temporal estimates of NO₂ concentrations are essential for proper prenatal exposure assessment. … The overall objective is to obtain accurate NO₂ estimates for use in prenatal exposure assessments. … In addition, we include the distance decay effect of emission sources on NO₂ concentrations for more efficient model construction. …

Science of The Total Environment (634), 1269-1277, 2018-09-01

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9

DATA ASSIMILATION OF RIVER WATER LEVELS BY DISTRIBUTED HYDROLOGICAL MODELS BASED ON OPTIMAL INTERPOLATION METHOD [in Japanese]

MIYAKE Shintaro , SAYAMA Takahiro , TAKARA Kaoru

流域全体で降雨流出から洪水氾濫までを一体的に予測する分布型水文モデルの開発が進められている．本研究は，このようなモデルのリアルタイム運用を目指して，最適内挿法による河川水位のデータ同化法を提案する．この手法は，複数の事前シミュレーションから背景誤差共分散行列を推定し，観測水位情報に基づいて流域内の河川水位を更新する．提案手法を兵庫県の千種川流域に適用し，同化の双子実験を行った結果，河川水位の分布は …

Journal of Japan Society of Civil Engineers, Ser. B1 (Hydraulic Engineering) 74(4), I_1009-I_1014, 2018

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10

Data assimilation of river water levels by distributed hydrological models based on the optimal interpolation method. [in Japanese]

Miyake Shintaro , Sayama Takahiro , Takara Kaoru

近年流域全体で降雨流出から洪水氾濫までを一体的に予測する分布型水文モデルの開発が進められている。本研究は、このようなモデルのリアルタイム運用を目指し、最適内挿法による河川水位のデータ同化手法を提案する。この手法は、複数の事前シミュレーションの水位相関および2点間の河道距離から背景誤差共分散行列を推定し、観測水位情報に基づいて流域内の河川水位を更新する。提案手法を兵庫県の千種川流域に適用し、同化の双 …

Proceeding of Annual Conference 31(0), 174, 2018

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11

Critical nonlinear Schrödinger equations in higher space dimensions

Hayashi Nakao , Li Chunhua , Naumkin Pavel I.

… Also we prove the two side sharp time decay estimates of solutions in the uniform norm. …

Journal of the Mathematical Society of Japan 70(4), 1475-1492, 2018

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12

Slowdown estimates for one-dimensional random walks in random environment with holding times

Dembo Amir , Fukushima Ryoki , Kubota Naoki

… We study the probability that the random walk travels slower than its typical speed and determine its decay rate asymptotic. …

Electronic Communications in Probability (23), 2018

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13

Lower Decay Estimates for Non-Degenerate Kirchhoff Type Dissipative Wave Equations

Ono Kosuke

… We derive the lower decay estimate ∥u(t)∥2 ≥ Ce−βt for t ≥ 0 with β > …

Journal of Mathematics (52), 39-52, 2018

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14

A note on the decay estimates for the compressible Navier-Stokes-Poisson system in critical Besov spaces (Mathematical Analysis of Viscous Incompressible Fluid)

Chikami Noboru , DANCHIN Raphael

… Under a suitable additional condition involving only the low frequencies of the data, we establish optimal decay estimates in the L^{2}-critical framework for the global solutions around small perturbations of a linearly stable constant state. …

数理解析研究所講究録 (2058), 26-42, 2017-10

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15

Duration of SHIV production by infected cells is not exponentially distributed: Implications for estimates of infection parameters and antiviral efficacy

Beauchemin Catherine A. A. , Miura Tomoyuki , Iwami Shingo

… Additionally, our predictions for the rate of plasma HIV decay under integrase inhibitor therapy offer an opportunity to confirm whether HIV production duration in vivo also follows a normal distribution, as demonstrated here for SHIV infections in vitro. …

Scientific Reports (7), 2017-02-16

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16

Studies of the setting of engineered barrier configuration utilized in geologic disposal:(1)Dissolution life-time of vitrified waste glass [in Japanese]

OHE Toshiaki , WAKASUGI Keiichiro

　地層処分におけるガラス固化体の溶解寿命を再評価した．我が国での地層処分の技術的可能性を論じた報告では，時間と共に処分温度が低下することや表面積が減少することなどを無視しているため，ガラス固化体の溶解寿命は約7万年と過小評価されている．しかし，これらの変化は物理的に確実に起こるものであるので，これらを無視せずに再評価を試みた．表面積の変化を考慮するために亀裂を有するガラス固化体を …

Journal of Nuclear Fuel Cycle and Environment 24(1), 27-32, 2017

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17

Asymptotic Behavior of Solutions for Kirchhoff Type Dissipative Wave Equations in Unbounded Domains

Ono Kosuke

… When the coefficient ρ or the initial energy E(0) is small at least, we show the global existence theorem and derive decay estimates of energies in the L2-frame. … Moreover, when the initial data belong to L1(RN)×L1(RN) in addition, we improve the decay rates of the solutions. …

Journal of Mathematics (51), 37-54, 2017

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18

On the Initial Value Problem for the Navier-Stokes Equations with the Initial Datum in Critical Sobolev and Besov Spaces

Khai D. Q. , Tri N. M.

… The key lemma is to establish the bilinear estimates in these spaces, due to the point-wise decay of the kernel of the heat semigroup. …

Journal of mathematical sciences, the University of Tokyo 23(2), 499-528, 2016-02-25

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19

Testing the importance of collective correlations in neutrinoless ββ decay

Menéndez Javier , Hinohara Nobuo , Engel Jonathan , Martínez-Pinedo Gabriel , Rodríguez Tomás R. , 日野原伸生

… We investigate the extent to which theories of collective motion can capture the physics that determines the nuclear matrix elements governing neutrinoless double-β decay. … We briefly examine heavier nuclei relevant for experimental double-β decay searches, in which shell-model calculations with all spin-orbit partners are not feasible; … our estimates suggest that isoscalar pairing also plays a significant role in these nuclei, though one we are less able to quantify precisely. …

Physical review C 93(1), 014305, 2016-01

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20

ANALYZING THE EFFECTS OF INPUT PARAMETERS ON WAVE COMPUTATIONS BASED ON THE THIRD GENERATION MODEL SWAN [in Japanese]

INOUCHI Kunimitsu , YAMAGUCHI Masataka , NONAKA Hirokazu , HINO Mikio , HATADA Yoshio

第3世代波浪推算モデルSWANの特性を調べるため，一様風とstormの各条件に対して波の発達・減衰式と海面抵抗係数Cdや時空間解像度を変えた計算を行った．主要な結果として，一様風条件に対し 1) 摩擦速度u*表示の無次元エネルギー& …

Journal of Japan Society of Civil Engineers, Ser. B3 (Ocean Engineering) 72(2), I_247-I_252, 2016

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