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Youichi Kobori,Yupa Hanboonsong 한국응용곤충학회 2017 Journal of Asia-Pacific Entomology Vol.20 No.1
The biological and life-history parameters of the leafhopper,Matsumuratettix hiroglyphicus (Matsumura), a vector of sugarcane white leaf phytoplasma,were studied on sugarcane host plants, at different constant temperatures, in the laboratory. The results revealed no complete life cycle development at extreme lowand high temperatures of 20 °C and 38 °C, respectively. There was a significant decrease in adult longevity, and reduced developmental time from egg to adult, with increasing temperatures. Low fecundity and reduced female oviposition period occurred at high temperatures. The sex ratio of male offspring appeared to be higher with increasing temperature (30–35 °C),while, at lower temperatures (25–27 °C), the ratio of female offspring appeared to be higher. According to the obtained life-history parameters, including intrinsic rate of increase (rm), finite rate of increase (λ), and net reproductive rate (R0) (rm=0.067, λ=10.70 days, and R0=21.2), 27 °C was the optimumtemperature for M. hiroglyphicus development. The lowest temperature developmental threshold and degree-days for leafhopper development from the egg to nymph stages was 11.5 °C and 132 degree-days, and for development from egg to adult, 12.8 °C and 345 degree-days. These results provide useful information for predicting M. hiroglyphicus population growth, and thus for evaluation of related insect control programs.
( Michiyo Kobori ),( Yasumasa Tojo ),( Takayuki Matsuo ),( Toshihiko Matsuto ) 한국폐기물자원순환학회(구 한국폐기물학회) 2017 한국폐기물자원순환학회 심포지움 Vol.2017 No.1
In past studies, it was reported that most of cesium (Cs) remained in the bottom ash and it became less soluble form when sewage sludge containing Cs was incinerated. Besides, from the thermodynamic equilibrium calculation, it was pointed out that Cs-aluminosilicate formed from Si, Al, etc. contained in sewage sludge under high temperature condition and this was the reason why Cs became less soluble. However, there is no study actually confirming the existence form of cesium in bottom ash of sewage sludge. If mechanism by which Cs becomes less soluble during the incineration process of sewage sludge is clarified, it can be applied for the treatment of decontamination waste that is still generating now. Therefore, in this research, the following two objectives were set; 1) to elucidate mechanism that Cs in sewage sludge becomes less soluble during incineration process; 2) to examine the possibility of Cs becoming less soluble by co-combustion of both Cs-containing waste and sewage sludge. In order to confirm the mechanism by which cesium becomes less soluble in the incineration process, Cs2CO3 and sewage sludge were heated together at 900℃ for 2 hours, and the ash for observation was obtained. By the elemental composition analysis using XRF, it was found that Fe, Si, Al, P, Sr were major elements contained in the ash. Based on the mass balance on Cs, about 75% of Cs remained in the ash and it became less soluble form. Subsequently, several thin section samples of the ash particle were created and they were analyzed by Scanning Electron Microscope with Energy Dispersive X-ray Spectroscopy (SEM-EDS) and Electron Probe Micro Analyzer (EPMA). Mapping of Cs using EPMA or SEM-EDS revealed that Cs presented inside the ash particles. However, there was no tendency that the specific element was particularly high at the region where Cs existed. At last, to confirm the applicability of this capturing mechanism to MSW fly ash containing Cs, CsCl and sewage sludge were heated together. This is because Cs contained in fly ash was mainly chloride and it is well known that CsCl is highly volatile and easily soluble. Even when Cs2CO3 was changed to CsCl, the amount of Cs remained in the ash after heating and the proportion of less soluble form were almost the same. In other words, it can be said that the sewage sludge can suppress volatilization of Cs during incineration and capture it inside the ash particle as less soluble form.
( Keiko Grace Kobori ) 한국서양고대역사문화학회(구 한국서양고대사학회) 2020 서양고대사연구 Vol.59 No.-
Divination in ancient Rome is one of the most controversial issues that reveal the characteristics of Roman religion. In Roman religion, their priesthood was an official appointed for life but not hereditary. This paper will discuss three major priesthoods regarding divination in the Roman state. Firstly, augurs conduct a divination by flights of birds or feeding of fowls. Summoned by the Senate or magistrates, they ask for the will of deities regarding the matter through augury. Secondly, quindecimviri sacris faciundis, or fifteen men responsible for sacrifice, deal with not only sacrificial matters but also the Sibylline Books. When unusual phenomena are reported to the Senate to be determined as ill omens, they summon them to consult the Sibylline Books to find out which action incurs the wrath of deities and which ritual is necessary to appease them. Lastly, haruspex, which was originally Etruscan priesthood, conducts a divination by examining livers of sacrificial animals. If all livers show no abnormality, the sacrifice is thought to be accepted by deities. To sum up, the procedure of these priesthoods clarifies that Roman divination is not foretelling the unpredictable future but proceeded like legal procedures, which will be the distinctive characteristics of Roman religion.
Study on Foreign Body Passage in an Ultra-Small Axial Flow Hydraulic Turbine
Yasuyuki Nishi,Tomoyuki Kobori,Yutaka Kobayashi,Terumi Inagaki,Norio Kikuchi 한국유체기계학회 2020 International journal of fluid machinery and syste Vol.13 No.1
Ultra-small axial flow hydraulic turbines, which are of the size of your palm, are a type of turbine that can be applied to the low heads of existing pipelines and open channels. However, due to their compact size, they are more likely to malfunction in case of foreign body contamination. In our study, we observed the passage of foreign bodies through an ultra-small axial flow hydraulic turbine and their encounter with the blocking mechanism of the turbine. We selected polyethylene ropes of varying lengths with a wire diameter of 5 mm to serve as foreign bodies. By varying the length of the rope, we were able to visually observe the movement of the foreign body. The turbine’s blocking mechanism can be broadly classified as guide vanes or runners. In the case of runner, blocking occurs when foreign bodies are bent and are caught at the leading edge of the blade. The passage rate through the hydraulic turbine is largely dependent on the passage rate at the runner section, which decreases proportionally with the length of the foreign body and the rotational speed of the blades.