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排序方式: 共有62条查询结果,搜索用时 28 毫秒
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2.
Shin-ichiro Sekimiya Eikoh Kobayashi Nobukatsu Nemoto Yukihiko Ueno Koji Ikeda Nobuo Takamiya 《Polymer Bulletin》1991,27(1):37-40
Summary Liquid crystalline side-chain polysiloxanes were prepared without metal complex catalyst. Mesogenic groups such as cholesteryl, 4-cyano-4-biphenyl and 4-methoxy-4-biphenyl group were introduced into polysiloxane by esterification and from DSC measurements they were compatible with other liquid crystalline polysiloxanes reported previously. 相似文献
3.
H Tada N Aihara T Ohe C Yutani S Hamada H Miyanuma M Takamiya S Kamakura 《Canadian Metallurgical Quarterly》1998,81(4):519-522
In all experimental mammals tested (rats, dogs, primates), intramuscular injections of the oil-soluble antimalarial artemisinin derivatives artemether and arteether have produced an unusual pattern of selective damage to brain stem centers predominantly involved in auditory processing and vestibular reflexes. Artesunate, the most widely used of these compounds, is a water soluble hemisuccinate derivative given parenterally either by intravenous or intramuscular injection. The neurotoxic potential of parenteral artesunate and artemether was compared in a murine model. Adult Swiss albino mice were assigned randomly to 28-day regimens of intramuscular artemether or artesunate in doses ranging from 30 to 100 mg/kg/day. At 30 mg/kg/day, no abnormalities were detected with either drug. At 50 mg/kg/day, abnormalities were observed in six of 12 artemether recipients and two of 12 artesunate recipients. These were reversible in all but one (artemether) mouse. At 100 mg/kg/day, eight of 36 artemether recipients, two of 36 artesunate recipients, and one of 18 control mice died. All but four surviving mice in the artemether group (86%) showed obvious and usually irreversible abnormalities of balance and equilibrium, whereas only four artesunate recipients (11%) exhibited abnormalities, and these were reversible in each case (P < 0.001). At this dose the relative risk (95% confidence interval) for death or disability was 5.3 (2.6-11.2) for artemether recipients. Intramuscular artemether is significantly more neurotoxic than intramuscular artesunate in this murine model. 相似文献
4.
Kadota Y. Chino K. Onodera Y. Namizaki H. Takamiya S. 《Quantum Electronics, IEEE Journal of》1984,20(11):1247-1251
The reliability of 870-900 nm AlGaAs TJS lasers has been investigated. An emission wavelength longer than 870 nm is realized by utilizing the band tailing effect due to heavy Zn-diffusion in the active region. A nonabsorbing mirror structure is employed to eliminate both gradual degradation and catastrophic damage of the facets. Stable continuous operation for over 10 000 hours has been confirmed at ambient temperatures higher than 50°C and output powers more than 5 mW/ facet. MTTF longer than 105hours is expected for screened devices. Surge endurance has been improved to be nearly one order of magnitude higher than that for a conventional structure. 相似文献
5.
Reti Irving M.; Crombag Hans S.; Takamiya Kogo; Sutton Jeffrey M.; Guo Ning; Dinenna Megan L.; Huganir Richard L.; Holland Peter C.; Baraban Jay M. 《Canadian Metallurgical Quarterly》2008,122(4):760
Although long-lasting effects of drug withdrawal are thought to play a key role in motivating continued drug use, the mechanisms mediating this type of drug-induced plasticity are unclear. Because Narp is an immediate early gene product that is secreted at synaptic sites and binds to alpha-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid (AMPA) receptors, it has been implicated in mediating enduring forms of synaptic plasticity. In previous studies, the authors found that Narp is selectively induced by morphine withdrawal in the extended amygdala, a group of limbic nuclei that mediate aversive behavioral responses. Accordingly, in this study, the authors evaluate whether long-term aversive effects of morphine withdrawal are altered in Narp knockout (KO) mice. The authors found that acute physical signs of morphine withdrawal are unaffected by Narp deletion. However, Narp KO mice acquire and sustain more aversive responses to the environment conditioned with morphine withdrawal than do wild type (WT) controls. Paradoxically, Narp KO mice undergo accelerated extinction of this heightened aversive response. Taken together, these studies suggest that Narp modulates both acquisition and extinction of aversive responses to morphine withdrawal and, therefore, may regulate plasticity processes underlying drug addiction. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
6.
A novel electrically induced body dynamic threshold metal oxide semiconductor (EIB-DTMOS) is proposed where the body is electrically induced by substrate bias and its high performance is demonstrated by experiments and simulations. EIB-DTMOS achieves a large body effect and a low Vth at the same time. The upper limit of the supply voltage of the EIB-DTMOS is higher than that of a conventional DTMOS, because the forward biased p-n junction leakage current of the EIB-DTMOS is lower. Among several DTMOSs, the accumulation mode EIB-DTMOS shows the highest drive-current at fixed off-current due to a large Vth Shift (or large back gate capacitance) and a suppressed short channel effect 相似文献
7.
Takebe M. Nakamura K. Paul N.C. Iiyama K. Takamiya S. 《Electron Devices, IEEE Transactions on》2004,51(3):311-316
Direct oxidation by an ultraviolet (UV) and ozone process and oxinitridation (plasma nitridation after oxidation) of GaAs surfaces were used to form nanometer-scale gate insulating layers for depletion-type recessed gate GaAs-MISFETs. The drain current-drain voltage characteristics of the oxide gate devices exhibit lower transconductance (max. 40 mS/mm), lower breakdown voltage and smaller gate capacitance than the oxinitrided gate devices. The presence of hysteresis in the oxide gate devices is also apparent. The maximum transconductance of the oxinitrided gate devices is 110 mS/mm and they have a sharper pinch-off, compared to the oxide gate devices. In addition, no hysteresis is observed in their current voltage curves. The current gain cutoff frequency of 1.4 /spl mu/m gate-length FETs for both types is 6 GHz. These results correspond well with results obtained from characterization of these insulating films. 相似文献
8.
M. Takemi T. Kimura T. Miura K. Goto Y. Mihashi S. Takamiya 《Journal of Electronic Materials》1996,25(3):369-374
A comparative study has been carried out regarding selective embedding growth of InP by metalorganic chemical vapor deposition
(MOCVD) around dry-etched mesas, using two types of reactors: a conventional horizontal type and a highspeed rotating-susceptor
type. In the case of the conventional horizontal-type MOCVD, overgrowth on the mask was observed when the growth temperature
was low (600°C). On the other hand, an almost planar grown surface without such overgrowth was achieved by using the high-speed
rotating-susceptor MOCVD for a wide range of growth temperatures, especially even at a low growth temperature of 580°C. Regarding
the high-speed rotating-susceptor MOCVD, we have also investigated the effects of dopants on the growth behaviors and have
found a remarkable difference between n-type S-doped and p-type Zn-doped InP in the growth behaviors. The mechanism for suppressing
overgrowth in case of the high-speed rotating-susceptor MOCVD, as well as the cause for the different effects between the
dopants, are discussed. 相似文献
9.
Onizuka K. Kawaguchi H. Takamiya M. Sakurai T. 《Solid-State Circuits, IEEE Journal of》2006,41(11):2382-2389
A VDD-hopping accelerator for on-chip power supply circuits is proposed and the effectiveness of the accelerator circuit is experimentally verified. The quick dropper with the linear regulator enables nanosecond-order transient time in on-chip distributed power supply systems. The measured transition time is less than 5 ns with a load circuit equivalent to 25-k logic gates in 0.18-mum CMOS. This is to be compared with the case without the accelerator of the order of mus and thus the acceleration by two orders of magnitude is achieved. Extensions of the basic approach are also discussed including implementation of the quick dropper for a switching DC-DC converter, the control stability improvement, automatic timing generation, and the parasitic element effects of the power lines 相似文献
10.
H. Sasaki DG K. Yajima N. Yoshida T. Ishida R. Hattori T. Sonoda O. Ishihara S. Takamiya R. Konishi K. Ando 《Journal of Electronic Materials》1996,25(5):559-563
We have investigated the degradation mechanism of Al0.48In0.52As/In0.53Ga0.47As/ InP high electron mobility transistors (HEMTs) using WSi ohmic electrodes. Cross-sectional transmission electron microscopy
(TEM) observation and en-ergy dispersive x-ray (EDX) analysis reveal impurities diffusion of gate electrode (titanium: Ti)
and fluorine (F) in the AlInAs layer after a high temperature (Ta = 170°C operating life test for 500 h. The decrease of drain current (Ids) during life test shows linear dependence on square root of aging time. It suggests that the degradation is controlled by
a diffusion mechanism. Hence, the estimated degradation mechanism of this device is related with decrease of carrier concentration
in the epitaxial layer by these diffused impurities. On the other hand, TEM and EDX show no degradation of WSi/InGaAs interface
after aging. Therefore, the WSi electrode for this type of HEMT demonstrates excellent high stability under the accelerated
operating life test. 相似文献