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Article
Intercrop** and flower strips to enhance natural enemies and control aphids: a comparative study in cabbage fields of Japan and Germany
Diversifying crop habitats and controlling arthropod pests by cultivating “secondary plants” alongside a primary crop is a frequently discussed strategy. The effectiveness of using secondary plants to manage p...
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Article
Flood Discharge Measurement by STIV Coupled with Maximum Entropy Method Using Parameter Estimation by Numerical Analysis
The coupling of surface velocity measurement by image analysis and the maximum entropy method (MEM) is a non-contact measurement technique to estimate river discharge during flood with high accuracy. The MEM c...
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Article
Effects of Different Turbulence Models on Prediction of Oscillating Hydraulic Jump at a Drop Structure with a Trench
Open-channel flows over a drop structure with a trench, often seen in urban rivers, may cause an oscillating phenomenon of hydraulic jumps depending on the trench geometry and hydraulic conditions. The oscilla...
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Chapter and Conference Paper
Geographical Distribution and Recent Change in the Meteorological Event Causing the Annual Maximum Wave Height and Storm Surge Around Japan
The meteorological events that induced the annual maximum wave heights and storm surges were collected from 35 wave observatories and 50 tide observatories in Japan. The geographical distributions of the meteo...
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Article
Open AccessEffects of vorticity on solitary waves
The vorticity effect on solitary wave profiles has not been solved experimentally; previous studies theoretically and numerically showed that when a solitary wave progressed in the positive direction, the effe...
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Article
Predation of syrphid larvae (Diptera: Syrphidae) on thrips in onion fields intercropped with barley
Syrphid larvae are well-known predators of aphids; however, we sometimes observed them on onion plants with thrips and without any aphids, which intercropped with barley in our previous study. Therefore, we hy...
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Article
Open AccessExtrapolating potential crop damage by insect pests based on land use data: examining inter-regional generality in agricultural landscapes
Inter-regional relationships between landscape factors and biological responses in natural conditions are important but difficult to predict because of the differences in each landscape context and local envir...
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Article
Large mothers produce progeny with high survival rates during the immature stage and large sizes at adulthood in a parasitoid species
Parasitoid researchers have generally thought that the body size of the mother parasitoid does not affect the fitness performance of the progeny during the immature stage, as long as the progeny develop in the...
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Article
Caste-fate determination primarily occurs after adult emergence in a primitively eusocial paper wasp: significance of the photoperiod during the adult stage
Independent-founding paper wasps constitute a major group of primitively eusocial insects, and when caste-fate determination occurs in temperate species of these wasps, particularly regarding whether it occurs...
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Chapter
The Valve Timing Effect on Cooling Power of 4 K Gifford-McMahon Cryocooler
The valve timing effect on cooling power of a Gifford-McMahon cryocooler was studied theoretically and experimentally. In this paper we describe first the theoretical refrigeration efficiency assuming an ideal...
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Chapter
4K Three-Stage Gifford-McMahon Cycle Refrigerator for MRI Magnet
The authors have succeeded in the development of a 4K Gifford- McMahon cycle cryogenic refrigerator capable of eliminating the evaporation of helium from a superconducting MRI magnet. We installed this refrige...
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Chapter and Conference Paper
A Conceptual Design of a Superconducting Magnet for a Magnetic Levitated Train Using a High Tc Oxide Superconducting Wire
A conceptual design of a superconducting magnet for magnetic levitated train (MAGLEV) using a silver sheathed wire of high Tc oxide superconductor is studied. In the conceptual design, the superconducting magn...
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Chapter
Effect of Regenerator on Gifford-Mcmahon Cycle Cryocooler Operating at About 4 K
Gifford-McMahon (GM) cycle cryocooler operating at about 4 K has been developed. The most important component of this cryocooler is a regenerator. This paper describes effects which regenerator materials, poro...
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Chapter
Helium Liquefaction by a Gifford-Mcmahon Cycle Cryocooler
This paper describes the principal design features and performance test results of a three-stage Gifford-McMahon cycle cryocooler by which the authors have achieved no-load temperature of 3.3 K and succeeded i...
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Chapter
Small Vuilleumier Cooler
There has recently been much interest in spacecraft borne long lifetime mechanical coolers in Japan, because the cooling loads of IR detectors (IRCCD) for Earth observation instruments have become greater than...
