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Photoperiodic modulation of insect circadian rhythms
Tomioka, Kenji,Uwozumi, Kouzo,Koga, Mika Korean Society of Photoscience 2002 Journal of Photosciences Vol.9 No.2
Circadian rhythms can be seen in a variety of physiological functions in insects. Light is a powerful zeitgeber not only synchronizing but also modulating the rhythm to adjust insect's temporal structure to seasonal changes in the environmental cycle. There are two general effects of the length of light phase within 24 hr light cycles on the circadian rhythms, i.e., the modulation of free-running period and the waveform. Since the photoperiodic modulation of the free-running period is induced even in the clock mutant flies, per$\^$s/, the free-running period is not fully determined genetically. In crickets, the ratio of activity (a) and rest phase (p) under the constant darkness (DD) is clearly dependent on the photoperiod under which they have been kept. When experienced the longer photoperiod it becomes smaller. The magnitude of change in a/p-ratio is dependent on the number of cycles they experienced. The neuronal activity of the optic lobe in DD shows the a/p-ratio changing with the preceding photoperiod. These data suggest that a single circadian pacemaker stores and maintains the photoperiodic information and that there is a system that accumulates the effects of single photoperiod to cause greater effects.
The Effect of the Aging of Red Blood Cells on Rheological Properties and Hemolysis
Jun TOMIOKA,Kazuhiro MOTOKUBO,Hisayoshi WATANABE 한국트라이볼로지학회 2002 한국트라이볼로지학회 학술대회 Vol.2002 No.10
It is well known that red blood cells (RBCs) are suffered from chronic stresses in systemic circulation. The objective of this study is to clarify the effect of the aging of RBCs on rheological properties and hemolysis. Initially, RBCs age fractionation was performed by using a high-speed centrifugation (15[min] at 1500[G]), then young and aged RBCs were suspended in plasma to adjust the hematocrit level of 40[%]. After this pretreatment, the viscosity was measured by using a capillary type and a cone-plate type viscometers, respectively, and the hemolysis test was carried out by a seesaw type shaker. Results from these experiments showed that the viscosity of the aged RBCs measured by the capillary viscometer was increased by 10[%] as compared with that of the young RBCs. Under the condition of all shear zones, the viscosity of the aged RBCs was increased in case of using the cone-plate type viscometer. And the hemolytic level was increased twice as the aging. The data obtained in this study indicated that the ability of aggregation of RBCs was increased and the deformability of RBCs' membrane got lower with the aging. Furthermore, it was exhibited that the fragility of RBCs' membrane was increased with the aging.
Women’s Dances from the Javanese Court
Michi Tomioka 국립민속박물관 2012 International Journal of Intangible Heritage Vol.7 No.-
Srimpi and bedhaya, danced by women at the Javanesecourt, developed into court rituals from the end of the 16thcentury. The choreography of these dances expressesideas like the peace and order of the cosmos, the unity ofgood and evil or of God and man. These dances were firstmade available to the general public through a nationalproject called the PKJT in 1970. This project did not justrevive the dances, it also shortened and adapted them fora modern audience in the belief that the traditional danceswere boring and monotonous. The new versions are widelyknown through recordings and are taught in art colleges. However, few dancers now know the original, full-lengthversions of the dances. I discuss how the meditativequality of these dances was lost when they were simplified. New ways of explaining the dances are now needed if theyare to be understood and appreciated by modernaudiences.
Recent Topics on Injection and Combustion in High Speed Flow (Keynote)
Sadatake Tomioka 한국추진공학회 2009 한국추진공학회 학술대회논문집 Vol.2009 No.11
Wall flush mounted injector with various orifice shape and injection conditions, were examined to enhance jet penetration and mixing in supersonic cross flow, in view of application to air-breathing accelerator vehicle. Orifice shapes with high aspect ratio were found to preferable for better penetration in the cold flow, and in the reacting flow for scramjet-mode combustion conditions. However, the effectiveness of the high aspect ratio was diminished in the dual-mode combustion conditions. Supersonic injection was applied to the high aspect ratio orifice, and further increase in penetration was observed in the cold and reactive flow for scramjet-mode combustion conditions, however, mixing enhancement due to mixing layer / pseudo-shock wave system interaction was dominant in the dual-mode combustion conditions. Difficulty in attaining ignition in the case with the high aspect ratio orifice was encountered during the combustion tests.
A Study of Magnetic Fluid Seals for Blood Sealing
Jun TOMIOKA,Akira FUKAISHI,Takashi OHBA 한국트라이볼로지학회 2002 한국트라이볼로지학회 학술대회 Vol.2002 No.10
Magnetic fluid seals are used in a wide variety of gas and dust sealing applications. However, it is difficult to seal for liquid because of its characteristic. This study will be a basic guide for a magnetic fluid seal for liquid, especially for blood to be practically used in medical instruments such as rotary blood pumps by clarifying its seal properties. Sealing pressure test, durability test, and hemolysis test have been conducted for this seal. In this study, magnetic fluid, sealing fluid, eccentricity ratio, revolution speed were selected as parameters. As results of the tests, it has been found that the properties of magnetic fluid seal depend on the solvent and the saturation magnetization of magnetic fluid. Therefore, the selection of magnetic fluid is important for this seal. It also has been found that eccentricity ratio of the shaft caused harmful effect for seal propertles. In conclusion, it has been showed that magnetic fluid seals could be possibly used in medical instruments such as blood pumps when blood come in contact with magnetic fluids.