http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Lateral photoconductivity and bound states of self-assembled Ge/Si quantum dots
Lee, S-W,Kim, T G,Hirakawa, K,Kim, J S,Choi, S-H,Cho, H Y IOP Pub 2007 Nanotechnology Vol.18 No.10
<P>We have investigated lateral conduction mid-infrared photodetectors using the photoionization of holes in the valence band of self-assembled Ge/Si quantum dots. A mid-infrared photocurrent signal was observed in the photon energy range of 140–400 meV resulting from an intersubband transition in the valence band of self-assembled Ge quantum dots and subsequent lateral transport of photoexcited carriers in the SiGe conduction channel. The peak responsivity was 134 mA W<SUP>−1</SUP> at a photon energy of 240 meV at <I>T</I> = 10 K. Furthermore, the band structure of the Ge QD system was estimated using electrical and optical measurements.</P>
Effect of Partial Magnetic Order on Resistivity and Thermopower of Ho(Co1−xAlx)2 Alloys
T. Nakama,C. Zukeran,A. Nakamura,A. Teruya,S. Hirakawa,S. Watanabe,Y. Hiranaka,M. Takeda,M. Hedo,K. Yagasaki,Y. Takaesu,K. Uchima,A. T. Burkov 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.63 No.3
The electrical resistivity and the thermopower S of Ho(Co1−xAlx)2 alloys (x = 0 to 0.2) weremeasured at temperatures from 2 K to 300 K in magnetic fields up to 10 T. While (T) and S(T)of pure HoCo2 reveal abrupt changes at the magnetic ordering temperature TC, indicating a firstordertransition, the temperature variations of both properties across the ordering temperature inHo(Co1−xAlx)2 alloys clearly show that the type of magnetic transition changes under substitutionof Al for Co from first order to second order around x 0.06. (T) of the Al-substituted samples (x= 0.15 and 0.2) has a very unusual variation at temperatures below TC: in contrast to the expectedand usually-observed decrease of (T), the resistivity of Ho(Co1−xAlx)2 alloys (x = 0.15 and 0.2)increases at temperatures below TC. Moreover, the magnetoresistance of these alloys is positivearound TC; this is also in a sharp contrast to the usually observed negative magnetoresistance. We show that the anomalous resistivity and magnetoresistance in these alloys are related to themetamagnetic instability of the Co 3d subsystem and to the fluctuating local magnetic susceptibilitydue to atomic substitution. Due to this fluctuating local magnetic susceptibility, the uniformexchange field of 4f moments induces a non-uniform polarization of the 3d system, with staticspatial fluctuations of the local magnetization. This static magnetic disorder gives an additionalcontribution (m) to the electrical resistance in the alloys at temperatures below TC. The degreeof this disorder changes with decreasing temperature, resulting in specific variation of m withtemperature.
Effects of VFAs and Glucose Infusions on Ruminating Behavior of the Fasted-Goats
Oshiro, S.,Kawamura, T.,Hirayama, T.,Hirakawa, M.,Higoshi, H. Asian Australasian Association of Animal Productio 1998 Animal Bioscience Vol.11 No.2
To test their roles in rumination behavior, metabolites (acetic acid, propionic acid, butyric acid and glucose) were intravenously infused into the jugular vein of goats during fasting. The heads of four female goats tested were locked in a stanchion of cages in an experimental room. Ruminating behaviors with regard to number of ruminations, ruminating time, number of remastications and remasticating time were significantly decreased by acetic acid infusion (p < 0.05), and tended to be depressed more on values in butyric acid infusion or glucose infusion than those in pre-infusions, but propionic acid infusion decreased a little. Those data suggest that rumination receptors sensitive to VFAs and glucose are more likely to be situated in the area, where they would respond too blood levels.
Lee, S-W,Hirakawa, K IOP Pub 2006 Nanotechnology Vol.17 No.15
<P>We report on mid-infrared photoconductivity of Be-doped p-type lateral conduction quantum dot infrared photodetectors and electronic states of the valence band in InAs self-assembled quantum dots. We have observed a broad photocurrent signal in a photon energy range of 100–400 meV (λ∼3–10 µm) due to bound-to-continuum intersublevel absorption of normal incidence radiation in the valence band of InAs self-assembled quantum dots, showing a peak sensitivity around <I>h</I>ν = 190 meV (λ∼6.5 µm). The observed responsivity was as high as 16 A W<SUP>−1</SUP> at <I>T</I> = 10 K. Furthermore, the activation energy from ground state in the quantum dot to the valence band of GaAs was estimated to be around 100 meV.</P>
EFFECTS OF ALTERNATING 6-HOUR LIGHT/DARK CYCLES ON THE RUMINATING BEHAVIOR OF FASTED GOATS
Oshiro, S.,Nakamae, H.,Furuta, K.,Hirakawa, M.,Higoshi, H. Asian Australasian Association of Animal Productio 1996 Animal Bioscience Vol.9 No.3
Experiments were conducted to study the effects of a dark (06:00-12:00), light (12:00-18:00), dark (18:00-24:00), and light (00:00-06:00) cycle on the ruminating behavior of five fasting female goats. Rumination time and number of boli were not different in the dark and light periods of the fed state or in the second and third days of fasting. Ruminating time and number of boli increased in the dark (06:00-12:00) period compared to the light (12:00-18:00) period during the first day of fasting. Ruminating time was higher after the first day of fasting than the fed state, and decreased substantially after the first day of fasting than the fed state, and decreased substantially after the second and third days of fasting compared to the fed state or the first day of fasting. Number of boli/day was not different among the fed state, the second and third days of fasting but was higher after the first day fasting compared to the fed state.