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다이어프램(diaphragm)의 형태에 따른 각형 CFT 기둥의 장기거동에 관한 실험적 연구
김태환 ( Kim¸ Tae-hwan ),김진근 ( Kim¸ Jin-keun ),이명재 ( Lee¸ Myung-jae ) 한국구조물진단유지관리공학회 2002 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.6 No.2
This paper presents experimental results on long-term behavior of rectangular CFT columns with various types of diaphragm. Ten CFT column specimens(150×l50×600 mm) were tested to investigate the influence of loading methods and shapes of diaphragm on the behavior. Five loading types were considered in this experiments.: loading (1) only steel tube, (2) steel tube and 1/2 cross sectional area of inner concrete, (3) steel tube and 3/4 cross sectional area of inner concrete. (4) entire section simultaneously, and (5) only inner concrete. Long-term behavior of rectangular CFT columns is greatly influenced by loading types and shapes of diaphragm. In the case of loading on entire section, vertical strains of steel and inner concrete had almost same magnitude at initial loading and with time. However, in the case of loading only on inner concrete, slip between inner concrete and steel tube occured at initial loading and increased with time.
Temperature-dependence of starvation resistance in Drosophila melanogaster
Taehwan Jang,Keonhee Kim,Kun Kim,Kwang Pum Lee 한국응용곤충학회 2017 한국응용곤충학회 학술대회논문집 Vol.2017 No.10
Temperature can affect the ability of insects to tolerate prolonged period of food deprivation through altering the amountof energy storage, the speed of energy expenditure, or the threshold energy storage for survival. In this study, we examinedthe mechanistic basis of the temperature-dependence of starvation resistance in Drosophila melanogaster. Starvation resistancedecreased as the temperature experienced during starvation rose from 18 to 28 ̊C. This warming-mediated decrease instarvation resistance was due to accelerated energy expenditure. However, the threshold energy storage for survival wasnot affected by starvation temperature. Exposure to warm temperatures during feeding led D. melanogaster to accumulatemore energy reserves and thus to become more starvation resistant. This study highlights the important role played bytemperature in shaping the phenotypic responses of insects to starvation.