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Institution

Utsunomiya University

EducationUtsunomiya, Japan
About: Utsunomiya University is a education organization based out in Utsunomiya, Japan. It is known for research contribution in the topics: Laser & Holography. The organization has 4139 authors who have published 6812 publications receiving 91975 citations. The organization is also known as: Utsunomiya daigaku.


Papers
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Journal ArticleDOI
TL;DR: Results demonstrate that this simple and rapid LAMP assay using a fluorometer portable device may be used to achieve real-time detection of begomoviruses under field conditions.

35 citations

Journal ArticleDOI
TL;DR: In this article, the suppression and release histories during canopy recruitment for these two species in two old-growth beech forests (at Takahara and Kaname) were reconstructed using dendrochronological data, which revealed that F crenata is able to be tolerant of a longer shade suppression than A mono.
Abstract: Beech forests occur widely in the mountains on the main island of Japan Wind storm is the major regime that causes canopy disturbances in these forests Fagus crenata Blume is a dominant, and Acer mono Maxim, also a canopy species, co-occurs in these forests It has been suggested that A mono is less shade-tolerant than F crenata Using dendrochronological data, this study describes suppression and release histories during canopy recruitment for these two species in two old-growth beech forests (at Takahara and Kaname) and provides support for the shade tolerance suggestion given above In addition, disturbance histories over the past 130 or 160 yr in the two forests have been reconstructed At Takahara, the forest experienced more frequent wind storms, was about 10–15 m shorter and less dense than that at Kaname Kaname is in a heavy snow region On average, F crenata experienced 14 and 25 definable episodes of suppression during canopy recruitment at Takahara and Kaname, respectively At Kaname, the average length of total suppression was 66 yr, and 34 yr at Takahara On average, at final release, the beech trees had a diameter of 25 cm and an age of about 125 yr old, which were twice as large and twice as old as those at Takahara In contrast, at the two sites, A mono experienced similar average numbers of episodes (16 episodes at Takahara and 18 episodes at Kaname) and similar average length of total suppression (37 yr at Takahara and 30 yr at Kaname) during canopy recruitment At both sites, at final release, the maple had an average diameter of about 18 cm and an average age of some 70 yr Our results have revealed that F crenata is able to be tolerant of a longer shade suppression than A mono At Kaname, the canopy disturbances deduced from tree-ring data were more intense or frequent than those at Takahara, This contrasted with occurrences of wind storms at the two sites

35 citations

Journal ArticleDOI
TL;DR: It is demonstrated that electrons are trapped well by the laser potential well, and that at the same time the acceleration by the longitudinal ponderomotive force induces the electron bunch compression, which can be compressed to the scale of the laser pulse length.
Abstract: A focused short-pulse laser of TEM (1,0)+TEM (0,1) mode has two intensity peaks in the radial direction, so that the transverse ponderomotive force may trap electrons between the two peaks. At the same time the longitudinal ponderomotive force may accelerate electrons at the head of the laser pulse, when the laser is focused. When the electrons move to the laser tail, the laser may diverge and the electron deceleration becomes relatively weak. Our numerical analyses demonstrate that electrons are trapped well by the laser potential well, and that at the same time the acceleration by the longitudinal ponderomotive force induces the electron bunch compression. This trapping and compression mechanism is unique: the electron bunch can be compressed to the scale of the laser pulse length.

35 citations

Journal ArticleDOI
TL;DR: In this paper, two types of windows are found in a symmetric circuit that cannot be seen in the logistic map and are inherent in the symmetric structure of this circuit.
Abstract: Two types of windows are found in a symmetric circuit that cannot be seen in the logistic map and are inherent in the symmetric structure of this circuit. One type of window exhibits complex bifurcation phenomena such as symmetry breaking and symmetry recovering in its own region, while the other type of window appears when one chaotic attractor bifurcates to two periodic attractors. The authors derive a one-dimensional Poincare map from the circuit by the degeneration technique and prove rigorously that the two types of windows appear alternatively and infinitely many times inside some windows by applying a certain scaling mechanism on the Poincare map. >

35 citations

Journal ArticleDOI
TL;DR: In this paper, the feasibility of utilization of forest biomass for energy in a mountainous region in Japan is discussed based on analyses with a geographic information system (GIS), and the relationship between the mass and the procurement cost of the forest biomass in the region was analyzed.
Abstract: The feasibility of utilization of forest biomass for energy in a mountainous region in Japan is discussed based on analyses with a geographic information system (GIS). In this study, ‘forest biomass’ denotes logging residues, thinned trees, and trees from broad-leaved forests. First, using the GIS, the distribution map of biomass resources was completed, and the topographical information of each sub-compartment was prepared. Second, harvesting and transportation systems were classified into six types by fraction of tree for energy (two types) and by topographical conditions (three types). Equations for cost calculation were developed and included the variables slope, skidding/yarding distance, and transportation distance. Finally, the relationship between the mass and the procurement cost of forest biomass in the region was analyzed. The results show that logging residues (the available amount was 4.035 Gg y −1 on a dry-mass basis) were the least costly followed by broad-leaved forests (20.317 Gg y −1 ) while thinned trees (27.854 Gg y −1 ) were the most costly. The analysis may support operational planning, especially the decision of selecting sub-compartments to be felled. For instance, the amount of biomass needed to supply a power-plant covering 24.8% of the regional household need was calculated to 30.106 Gg y −1 . This amount of forest biomass could optimally be harvested from sub-compartments whose procurement costs were lower than 108.6 US$ Mg −1 .

35 citations


Authors

Showing all 4148 results

NameH-indexPapersCitations
Kazuhito Hashimoto12078161195
Yoshinori Yamamoto8595028130
S. Uehara7860223493
Minghua Liu7467920727
Akira Fujishima7029969335
Satoshi Hasegawa6970822153
Donald A. Tryk6724025469
Hiromu Suzuki6525015241
Kunio Arai6429315022
Kazuo Suzuki6350717786
Jin Wang6019610435
James B. Reid6024611773
Richard L. Smith5930211420
Isao Kubo5830311291
Takao Yokota5724511813
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Performance
Metrics
No. of papers from the Institution in previous years
YearPapers
20236
202231
2021247
2020315
2019315
2018289