K. Takahashi

Publications95
h-index20
Citations1,107
Highly Influential Citations23
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  • Publications
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Hair analysis for drugs of abuse
The reliable analytical method for total morphine in hair was established by GC/MS-SIM. The calibration curve for morphine in hair showed linear over 0.5–100 ng/mg hair. Though the limit of detection… Expand
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Disturbance regimes and community structures of a riparian and an adjacent terrace stand in the Kanumazawa Riparian Research Forest, northern Japan
Riparian forests and adjacent upland forests often exhibit differences in composition and diversity. This variation should be due in part to difference in site condition and in part to difference in… Expand
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Measurement of the energy distribution of trapped and free electrons in a current-free double layer
In the high potential plasma, upstream of the double layer, the measured electron energy distribution function EEDF shows a very clear change in slope at energies break corresponding to the double… Expand
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Effects of microenvironmental heterogeneity on the seed-to-seedling process and tree coexistence in a riparian forest
In a temperate riparian forest, the effects of substrate types, canopy gaps and conspecific seedfall density were investigated on the seed-to-seedling process for the five dominant species (Aesculus… Expand
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Helicon-type radiofrequency plasma thrusters and magnetic plasma nozzles
Development of electrodeless radiofrequency plasma thrusters, e.g., a helicon thruster, has been one the of challenging topics for future high-power and long-lived electric propulsion systems. The… Expand
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Direct thrust measurements and modelling of a radio-frequency expanding plasma thruster
It is shown analytically that the thrust from a simple plasma thruster (in the absence of a magnetic field) is given by the maximum upstream electron pressure, even if the plasma diverges downstream.… Expand
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A magnetic nozzle calculation of the force on a plasma
The measured axial force imparted from a magnetically expanding current-free plasma has been shown recently [Takahashi, Phys. Rev. Lett. 107, 235001 (2011)] to equal the axial force on that plasma… Expand
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Frequency-tuning radiofrequency plasma source operated in inductively-coupled mode under a low magnetic field
A radiofrequency (rf) inductively-coupled plasma source is operated with a frequency-tuning impedance matching system, where the rf frequency is variable in the range of 20–50 MHz and the maximum… Expand
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Radial characterization of the electron energy distribution in a helicon source terminated by a double layer
Electron energy probability functions (EEPFs) are measured across the radius (0⩽r<6.85cm) of a low pressure (0.3mTorr) helicon plasma source terminated by a current-free double layer. The source… Expand
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Seedling dynamics of Acer mono and Fagus crenata: an environmental filter limiting their adult distributions
The difference in distribution of tree populations between riparian sites and terraces might be explained by differential limitation of cohort establishment in the early stages of a tree’s life… Expand
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