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TRIBO-COATING FOR FRICTION CONTROL IN ULTRA HIGH VACUUM
Kato, Koji,Adachi, Koshi,Oyamada, Tomonaga ENGINEERING TRIBOLOGY RESEARCH INSTITUTE KYUNGPOOK 1998 INTERNATIONAL SYMPOSIUM ON HIGH PERFORMANCE OF TRI Vol.1998 No.-
Effectiveness of in-situ friction assisted deposition technique named "tribo-coating" as practical solid lubrication method was clearly shown from the view point of friction coefficient. That is to say, under practical friction conditions of contact pressure and sliding velocity for space machine, effective value of friction coefficient less than 0.15 could be obtained by tribo-coating of indium. In addition, it was clear that the tribo-coating of indium could give a third to one fifth times smaller friction coefficient than that of conventional soft metal coating as solid lubricant. Furthermore, friction coefficient could be controlled to keep low by in-situ tribo-coating at stable friction condition could decrease friction coefficient comparison with that of the first tribo-coating. The minimum friction coefficient of 0.018 was observed by using second-tribo-coating of indium in the friction couple of silicon nitride against stainless steel.
Maiko Satomoto,Yushi U Adachi,Koshi Makita 대한마취통증의학회 2017 Korean Journal of Anesthesiology Vol.70 No.1
Background: Droperidol (DHB) reportedly reduces the dose of propofol needed to achieve hypnosis when anesthesia is induced and decreases the bispectral index (BIS) in propofol-sedated patients during spinal anesthesia. We reported previously that supplemental DHB decreased the BIS after the administration of sevoflurane and remifentanil. This study investigated the effect of DHB on desflurane (DES) consumption in a clinical setting. Methods: We conducted a prospective, randomized double-blinded study of 35 women with American Society of Anesthesiologist physical status I or II who underwent a mastectomy. Either DHB (20 μg/kg) or a saline placebo was administered to patients 30 min after the induction of anesthesia. A blinded anesthesiologist maintained a BIS value of 50 during anesthesia by modulating inhaled DES concentrations that changed 0.5% at 2.5 min intervals and maintained analgesia via the constant administration of remifentanil by referring to vital signs. The primary endpoint was the effect of DHB on DES consumption. The secondary endpoints included blood circulatory parameters, the time from the end of surgery to extubation, and discharge time between the groups. Results: The characteristics of the patients did not differ between the groups. The DHB group used a mean of 27.2 ± 6.0 ml of DES compared with 41.4 ± 9.5 ml by the placebo group (P < 0.05). Conclusions: A small dose of DHB reduced the DES concentration needed to maintain a BIS of 50. Our results show that DHB reduced the consumption of DES without adverse effects.
ZhongLiang Sun,Maiko Satomoto,Yushi U Adachi,Koshi Makita 대한마취통증의학회 2017 Korean Journal of Anesthesiology Vol.70 No.3
Background: Neonatal exposure to anesthetics induces neuronal apoptosis and long-term cognitive dysfunction in rodents. We showed that the nicotinamide adenine dinucleotide phosphate-oxidase inhibitor apocynin not only reduces neurotoxicity by decreasing superoxide levels and preventing mitochondrial dysfunction but also improves long-term memory impairment in neonatal mice exposed to sevoflurane. We also found that after the contextual fear conditioning test, glutamatergic neurons expressed c-Fos (neural activation) regardless of previous exposure to sevoflurane. Moreover, there were fewer c-Fos-expressing glutamatergic neurons in the basolateral amygdala (BLA) after exposure to sevoflurane than after exposure to carrier gas. In this study, we investigated whether the administration of apocynin prior to sevoflurane exposure would preserve glutamatergic neurons in the BLA. Methods: Apocynin (50 mg/kg) was injected intraperitoneally into six-day-old male mice 30 min before 6 h of exposure to 3% sevoflurane or carrier gas only. The mice were allowed to mature and then were subjected to the contextual fear conditioning test. The neural activation and neuron population in the BLA were investigated 2 h later. Results: Administration of apocynin prior to neonatal sevoflurane exposure not only prevented learning deficits but also preserved c-Fos-expressing glutamatergic neurons in the BLA. Conclusions: Apocynin mitigates the cognitive impairment induced by neonatal sevoflurane exposure and preserves c- Fos-expressing glutamatergic neurons in the basolateral amygdala.
Static and Dynamic Characteristics of Active-head Sliders
Lizhi SU,Masayuki KURITA,Junguo XU,Koji KATO,Koshi ADACHI 한국트라이볼로지학회 2002 한국트라이볼로지학회 학술대회 Vol.2002 No.10
Active-head sliders with a unimorph piezoelectric actuator for flying height control were experimentally evaluated. It was found that the normalized stroke of the actuator is 5.2 to 6 ㎚/V/㎜ without flying over the disk. However, the normalized adjustment range of flying height is about 1.6 ㎚/V/㎜ when the active-head slider is flying over the disk. This value is smaller than the measured value when the slider is not flying, because of the air pressure generated at the active pad when the pad approaches the disk surface.